Changelog (Version History)

This page lists all the available versions of the library, in chronological order. You should read this when upgrading the library to know where your code can break, and where it can take advantage of new goodies!

New layer (v1.36)

Scheme layer used: 181

View new and changed raw API methods.

Bug fixes

New layer (v1.35)

Scheme layer used: 178

View new and changed raw API methods.


  • drop_author parameter now exposed in forward_messages.


  • “Custom secret support” should work with TcpMTProxy.

  • Some type hints should now be more accurate.

Bug fixes

  • Session path couldn’t be a pathlib.Path or None.

  • Python versions older than 3.9 should now be supported again.

  • Readthedocs should hopefully build the v1 documentation again.

New layer (v1.34)

Scheme layer used: 173

View new and changed raw API methods.


  • reply_to_chat and reply_to_sender are now in Message. This is useful when you lack access to the chat, but Telegram still included some basic information.

Bug fixes

  • parse_mode with a custom instance containing both parse and unparse should now work.

  • Parsing and unparsing message entities should now behave better in certain corner-cases.

New layer (v1.33)

Scheme layer used: 167

View new and changed raw API methods.


  • webbrowser is now imported conditionally, to support niche environments.

  • Library should now retry on the suddenly-common TimedOutError.

Bug fixes

  • Sending photos which were automatically resized should work again (included in the v1.32 series).

New layer (v1.32)

Scheme layer used: 166

View new and changed raw API methods.

This enables you to use custom languages in preformatted blocks using HTML:

  <code class='language-python'>from telethon import TelegramClient</code>

Note that Telethon v1’s markdown is a custom format and won’t support language tags. If you want to set a custom language, you have to use HTML or a custom formatter.

Dropped imghdr support (v1.31)

Scheme layer used: 165

This release contains a breaking change in preparation for Python 3.12. If you were sending photos from in-memory bytes or BytesIO containing images, you should now use BytesIO and set the .name property to a dummy name. This will allow Telethon to detect the correct extension (and file type).

# before
image_data = b'...'
client.send_file(chat, image_data)

# after
from io import BytesIO
image_data = BytesIO(b'...') = 'a.jpg'  # any name, only the extension matters
client.send_file(chat, image_data)

Bug fixes

  • Code generation wasn’t working under PyPy.

  • Obtaining markdown or HTML from message text could produce unexpected results sometimes.

  • Other fixes for bugs from the previous version, which were already fixed in patch versions.

Breaking Changes

  • imghdr is deprecated in newer Python versions, so Telethon no longer uses it. This means there might be some cases where Telethon fails to infer the file extension for buffers containing images. If you were relying on this, add .name = 'a.jpg' (or other extension) to the BytesIO buffers you upload.

Layer bump and small changes (v1.30)

Scheme layer used: 162

Some of the bug fixes were already present in patch versions of v1.29, but the new layer necessitated a minor bump.


  • Removed client-side checks for editing messages. This only affects Message.edit, as client.edit_message already had no checks.

  • Library should not understand more server-side errors during update handling which should reduce crashes.

  • Client-side image compression should behave better now.

Bug fixes

  • Some updates such as UpdateChatParticipant were being missed due to the order in which Telegram sent them. The library now more carefully checks for the sequence and pts contained in them to avoid dropping them.

  • Fixed is_inline check for KeyboardButtonWebView.

  • Fixed some issues getting entity from cache by ID.

  • reply_to should now work when sending albums.

More bug fixing (v1.29)

Scheme layer used: 160

This layer introduces the necessary raw API methods to work with stories.

The library is aiming to be “feature-frozen” for as long as v1 is active, so friendly client methods are not implemented, but example code to use stories can be found in the GitHub wiki of the project.


  • Removed client-side checks for methods dealing with chat permissions. In particular, this means you can now ban channels.

  • Improved some error messages and added new classes for more RPC errors.

  • The client-side check for valid usernames has been loosened, so that very short premium usernames are no longer considered invalid.

Bug fixes

  • Attempting to download a thumbnail from documnets without one would fail, rather than do nothing (since nothing can be downloaded if there is no thumb).

  • More errors are caught in the update handling loop.

  • HTML .text should now “unparse” any message contents correctly.

  • Fixed some problems related to logging.

  • comment_to should now work as expected with albums.

  • asyncio.CancelledError should now correctly propagate from the update loop.

  • Removed some absolute imports in favour of relative imports.

  • UserUpdate.last_seen should now behave correctly.

  • Fixed a rare ValueError during connect if the session cache was bad.

New Layer and housekeeping (v1.28)

Scheme layer used: 155

Plenty of stale issues closed, as well as improvements for some others.


  • New entity_cache_limit parameter in the TelegramClient constructor. This should help a bit in keeping memory usage in check.


  • progress_callback is now called when dealing with albums. See the documentation on client.send_file() for details.

  • Update state and entities are now periodically saved, so that the information isn’t lost in the case of crash or unexpected script terminations. You should still be calling disconnect or using the context-manager, though.

  • The client should no longer unnecessarily call get_me every time it’s started.

Bug fixes

  • Messages obtained via raw API could not be used in forward_messages.

  • force_sms and sign_up have been deprecated. See issue 4050 for details. It is no longer possible for third-party applications, such as those made with Telethon, to use those features.

  • events.ChatAction should now work in more cases in groups with hidden members.

  • Errors that occur at the connection level should now be properly propagated, so that you can actually have a chance to handle them.

  • Update handling should be more resilient.

  • PhoneCodeExpiredError will correctly clear the stored hash if it occurs in sign_in.

  • In patch v1.28.2, InputBotInlineMessageID64 can now be used to edit inline messages.

New Layer and some Bug fixes (v1.27)

Scheme layer used: 152

Bug fixes

  • When the account is logged-out, the library should now correctly propagate an error through run_until_disconnected to let you handle it.

  • The library no longer uses asyncio.get_event_loop() in newer Python versions, which should get rid of some deprecation warnings.

  • It could happen that bots would receive messages sent by themselves, very often right after they deleted a message. This should happen far less often now (but might still happen with unlucky timings).

  • Maximum photo size for automatic image resizing is now larger.

  • The initial request is now correctly wrapped in invokeWithoutUpdates when updates are disabled after constructing the client instance.

  • Using a pathlib.Path to download contacts and web documents should now work correctly.

New Layer and some Bug fixes (v1.26)

Scheme layer used: 149

This new layer includes things such as emoji status, more admin log events, forum topics and message reactions, among other things. You can access these using raw API. It also contains a few bug fixes.

These were fixed in the v1.25 series:

  • client.edit_admin did not work on small group chats.

  • client.get_messages could stop early in some channels.

  • client.download_profile_photo now should work even if User.min.

  • client.disconnect should no longer hang when being called from within an event handlers.

  • client.get_dialogs now initializes the update state for channels.

  • The message sender should not need to be fetched in more cases.

  • Lowered the severity of some log messages to be less spammy.

These are new to v1.26.0:

  • Layer update.

  • New documented RPC errors.

  • Sometimes the first message update to a channel could be missed if said message was read immediately.

  • client.get_dialogs would fail when the total count evenly divided the chunk size of 100.

  • client.get_messages could get stuck during a global search.

  • Potentially fixed some issues when sending certain videos.

  • Update handling should be more resilient.

  • The client should handle having its auth key destroyed more gracefully.

  • Fixed some issues when logging certain messages.

Bug fixes (v1.25.1)

This version should fix some of the problems that came with the revamped update handling.

  • Some inline URLs were not parsing correctly with markdown.

  • events.Raw was handling UpdateShort which it shouldn’t do.

  • events.Album should now work again.

  • CancelledError was being incorrectly logged as a fatal error.

  • Some fixes to update handling primarly aimed for bot accounts.

  • Update handling now can deal with more errors without crashing.

  • Unhandled errors from update handling will now be propagated through client.run_until_disconnected.

  • Invite links with + are now recognized.

  • Added new known RPC errors.

  • telethon.types could not be used as a module.

  • 0-length message entities are now stripped to avoid errors.

  • client.send_message was not returning a message with reply_to in some cases.

  • aggressive in client.iter_participants now does nothing (it did not really work anymore anyway, and this should prevent other errors).

  • client.iter_participants was failing in some groups.

  • Text with HTML URLs could sometimes fail to parse.

  • Added a hard timeout during disconnect in order to prevent the program from freezing.

Please be sure to report issues with update handling if you still encounter some errors!

Update handling overhaul (v1.25)

Scheme layer used: 144

I had plans to release v2 way earlier, but my motivation drained off, so that didn’t happen. The reason for another v1 release is that there was a clear need to fix some things regarding update handling (which were present in v2). I did not want to make this release. But with the release date for v2 still being unclear, I find it necessary to release another v1 version. I apologize for the delay (I should’ve done this a lot sooner but didn’t because in my head I would’ve pushed through and finished v2, but I underestimated how much work that was and I probably experienced burn-out).

I still don’t intend to make new additions to the v1 series (beyond updating the Telegram layer being used). I still have plans to finish v2 some day. But in the meantime, new features, such as reactions, will have to be used through raw API.

This update also backports the update overhaul from v2. If you experience issues with updates, please report them on the GitHub page for the project. However, this new update handling should be more reliable, and catch_up should actually work properly.

Breaking Changes

  • In order for catch_up to work (new flag in the TelegramClient constructor), sessions need to impleemnt the new get_update_states. Third-party session storages won’t have this implemented by the time this version released, so catch_up may not work with those.

Rushed release to fix login (v1.24)

Scheme layer used: 133

This is a rushed release. It contains a layer recent enough to not fail with UPDATE_APP_TO_LOGIN, but still not the latest, to avoid breaking more than necessary.

Breaking Changes

  • The biggest change is user identifiers (and chat identifiers, and others) now use up to 64 bits, rather than 32. If you were storing them in some storage with fixed size, you may need to update (such as database tables storing only integers).

There have been other changes which I currently don’t have the time to document. You can refer to the following link to see them early:…v1.24.0

New schema and bug fixes (v1.23)

Scheme layer used: 130

View new and changed raw API methods.


  • client.pin_message() can now pin on a single side in PMs.

  • Iterating participants should now be less expensive floodwait-wise.

Bug fixes

  • The QR login URL was being encoded incorrectly.

  • force_document was being ignored in inline queries for document.

  • manage_call permission was accidentally set to True by default.

New schema and bug fixes (v1.22)

Scheme layer used: 129

View new and changed raw API methods.


  • You can now specify a message in client.get_stats().

  • Metadata extraction from audio files with hachoir now recognises “artist”.

  • Get default chat permissions by not supplying a user to client.get_permissions().

  • You may now use thumb when editing messages.

Bug fixes

  • Fixes regarding bot markup in messages.

  • Gracefully handle ChannelForbidden in get_sender.

And from v1.21.1:

  • file.width and .height was not working correctly in photos.

  • Raw API was mis-interpreting False values on boolean flag parameters.

New schema and QoL improvements (v1.21)

Scheme layer used: 125

View new and changed raw API methods.

Not many changes in this release, mostly the layer change. Lately quite a few people have been reporting TypeNotFoundError, which occurs when the server sends types that it shouldn’t. This can happen when Telegram decides to add a new, incomplete layer, and then they change the layer without bumping the layer number (so some constructor IDs no longer match and the error occurs). This layer change should fix it.


  • now supports a password parameter, needed when doing things like changing the owner of a bot via @BotFather.


  • tgcrypto will now be used for encryption when installed.

Bug fixes

  • Message.edit wasn’t working in your own chat on events other than NewMessage.

  • client.delete_dialog() was not working on chats.

  • events.UserUpdate should now handle channels’ typing status.

  • InputNotifyPeer auto-cast should now work on other TLObject.

  • For some objects, False was not correctly serialized.

New schema and QoL improvements (v1.20)

Scheme layer used: 124

View new and changed raw API methods.

A bit late to the party, but Telethon now offers a convenient way to comment on channel posts. It works very similar to reply_to:

client.send_message(channel, 'Great update!', comment_to=1134)

This code will leave a comment to the channel post with ID 1134 in channel.

In addition, the library now logs warning or error messages to stderr by default! You no longer should be left wondering “why isn’t my event handler working” if you forgot to configure logging. It took so long for this change to arrive because nobody noticed that Telethon was using a logging.NullHandler when it really shouldn’t have.

If you want the old behaviour of no messages being logged, you can configure logging to CRITICAL severity:

import logging

This is not considered a breaking change because stderr should only be used for logging purposes, not to emit information others may consume (use stdout for that).



  • utils.resolve_invite_link handles the newer link format.

  • Downloading files now retries once on TimeoutError, which has been happening recently. It is not guaranteed to work, but it should help.

  • Sending albums of photo URLs is now supported.

  • EXIF metadata is respected when automatically resizing photos, so the orientation information should no longer be lost.

  • Downloading a thumbnail by index should now use the correct size ordering.

Bug fixes

  • Fixed a KeyError on certain cases with Conversation.

  • Thumbnails should properly render on more clients. Installing hachoir may help.

  • Message search was broken when using a certain combination of parameters.

  • utils.resolve_id was misbehaving with some identifiers.

  • Fix TypeNotFoundError was not being propagated, causing deadlocks.

  • Invoking multiple requests at once with ordered=True was deadlocking.

New raw API call methods (v1.19)

Scheme layer used: 122

Telegram has had group calls for some weeks now. This new version contains the raw API methods needed to initiate and manage these group calls, however, the library will likely not offer ways to stream audio directly.

Telethon’s focus is being an asyncio-based, pure-Python implementation to interact with Telegram’s API. Streaming audio is beyond the current scope of the project and would be a big undertaking.

However, that doesn’t mean calls are not possible with Telethon. If you want to help design a Python library to perform audio calls, which can then be used with Telethon (so you can use Telethon + that new library to perform calls with Telethon), please refer to @pytgcallschat and join the relevant chat to discuss and help with the implementation!

The above message was also posted in the official Telegram group, if you wish to discuss it further.

With that out of the way, let’s list the additions and bug fixes in this release:



  • Updated documentation and list of known RPC errors.

  • The library now treats a lack of ping responses as a network error.

  • client.kick_participant() now returns the service message about the user being kicked, so you can delete it.

Bug fixes

  • When editing inline messages, the text parameter is preferred if provided.

  • Additional senders are unconditionally disconnected when disconnecting the main client, which should reduce the amount of asyncio warnings.

  • Automatic reconnection with no retries was failing.

  • PhotoPathSize is now ignored when determining a download size, since this “size” is not a JPEG thumbnail unlike the rest.

  • events.ChatAction should misbehave less.

New layer and QoL improvements (v1.18)

Scheme layer used: 120

Mostly fixes, and added some new things that can be done in this new layer.

For proxy users, a pull request was merged that will use the python-socks library when available for proxy support. This library natively supports asyncio, so it should work better than the old pysocks. pysocks will still be used if the new library is not available, and both will be handled transparently by Telethon so you don’t need to worry about it.


  • New client.set_proxy() method which lets you change the proxy without recreating the client. You will need to reconnect for it to take effect, but you won’t need to recreate the client. This is also an external contribution.

  • New method to unpin messages client.unpin_message().


  • Empty peers are excluded from the list of dialogs.

  • If the python-socks library is installed (new optional requirement), it will be used instead of pysocks for proxy support. This should fix some issues with proxy timeouts, because the new library natively supports asyncio.

  • client.send_file() will now group any media type, instead of sending non-image documents separatedly. This lets you create music albums, for example.

  • You can now search messages with a from_user that’s not a user. This is a Telegram feature, we know the name isn’t great, but backwards-compatibility has to be kept.

Bug fixes

  • Fixes related to conversation timeouts.

  • Large dates (over year 2038) now wrap around a 32-bit integer, which is the only way we can represent them to Telegram. Even if “wrong”, it makes things not crash, and it’s the best we can do with 32-bit dates.

  • The library was accidentally using a deprecated argument in one of its friendly methods, producing a warning.

  • Improvements to the way marked IDs are parsed.

  • SlowModeWaitError floods are no longer cached.

  • Getting the buttons for a message could fail sometimes.

  • Getting the display name for “forbidden” chats now works.

  • Better handling of errors in some internal methods.

Channel comments and Anonymous Admins (v1.17)

Scheme layer used: 119

New minor version, new layer change! This time is a good one to remind every consumer of Python libraries that you should always specify fixed versions of your dependencies! If you’re using a requirements.txt file and you want to stick with the old version (or any version) for the time being, you can use the following syntax:


This will install any version compatible with the written version (so, any in the 1.16 series). Patch releases will never break your code (and if they do, it’s a bug). You can also use that syntax in pip install. Your code can’t know what new versions will look like, so saying it will work with all versions is a lie and will cause issues.

The reason to bring this up is that Telegram has changed things again, and with the introduction of anonymous administrators and channel comments, the sender of a message may not be a User! To accomodate for this, the field is now a Peer and not int. As a reminder, it’s always a good idea to use Telethon’s friendly methods and custom properties, which have a higher stability guarantee than accessing raw API fields.

Even if you don’t update, your code will still need to account for the fact that the sender of a message might be one of the accounts Telegram introduced to preserve backwards compatibility, because this is a server-side change, so it’s better to update and not lag behind. As it’s mostly just a single person driving the project on their free time, bug-fixes are not backported.

This version also updates the format of SQLite sessions (the default), so after upgrading and using an old session, the session will be updated, which means trying to use it back in older versions of the library won’t work.

For backwards-compatibility sake, the library has introduced the properties Message.reply_to_msg_id and Message.to_id that behave like they did before (Telegram has renamed and changed how these fields work).

Breaking Changes

  • Message.from_id is now a Peer, not int! If you want the marked sender ID (much like old behaviour), replace all uses of .from_id with .sender_id. This will mostly work, but of course in old and new versions you have to account for the fact that this sender may no longer be a user.

  • You can no longer assign to Message.reply_to_msg_id and Message.to_id because these are now properties that offer a “view” to the real value from a different field.

  • Answering inline queries with a photo or document will now send the photo or document used in the resulting message by default. Not sending the media was technically a bug, but some people may be relying on this old behaviour. You can use the old behaviour with include_media=False.


  • New raise_last_call_error parameter in the client constructor to raise the same error produced by the last failing call, rather than a generic ValueError.

  • New formatting_entities parameter in client.send_message(), and client.send_file() to bypass the parse mode and manually specify the formatting entities.

  • New client.get_permissions() method to query a participant’s permissions in a group or channel. This request is slightly expensive in small group chats because it has to fetch the entire chat to check just a user, so use of a cache is advised.

  • now works on normal polls!

  • New local_addr parameter in the client constructor to use a specific local network address when connecting to Telegram.

  • client.inline_query() now lets you specify the chat where the query is being made from, which some bots need to provide certain functionality.

  • You can now get comments in a channel post with the reply_to parameter in client.iter_messages(). Comments are messages that “reply to” a specific channel message, hence the name (which is consistent with how Telegram’s API calls it).


  • Updated documentation and list of known errors.

  • If hachoir is available, the file metadata can now be extracted from streams and in-memory bytes.

  • The default parameters used to initialize a connection now match the format of those used by Telegram Desktop.

  • Specifying 0 retries will no longer cause the library to attempt to reconnect.

  • The library should now be able to reliably download very large files.

  • Global search should work more reliably now.

  • Old usernames are evicted from cache, so getting entities by cached username should now be more reliable.

  • Slightly less noisy logs.

  • Stability regarding transport-level errors (transport flood, authorization key not found) should be improved. In particular, you should no longer be getting unnecessarily logged out.

  • Reconnection should no longer occur if the client gets logged out (for example, another client revokes the session).

Bug fixes

  • In some cases, there were issues when using events.Album together with events.Raw.

  • For some channels, one of their channel photos would not show up in client.iter_profile_photos().

  • In some cases, a request that failed to be sent would be forgotten, causing the original caller to be “locked” forever for a response that would never arrive. Failing requests should now consistently be automatically re-sent.

  • The library should more reliably handle certain updates with “empty” data.

  • Sending documents in inline queries should now work fine.

  • Manually using client.sign_up should now work correctly, instead of claiming “code invalid”.

Special mention to some of the other changes in the 1.16.x series:

  • The thumb for download_media now supports both str and VideoSize.

  • Thumbnails are sorted, so -1 is always the largest.

Bug Fixes (v1.16.1)

The last release added support to force_file on any media, including things that were not possible before like .webp files. However, the force_document toggle commonly used for photos was applied “twice” (one told the library to send it as a document, and then to send that document as file), which prevented Telegram for analyzing the images. Long story short, sending files to the stickers bot stopped working, but that’s been fixed now, and sending photos as documents include the size attribute again as long as Telegram adds it.


  • When trying to client.start() to another account if you were previously logged in, the library will now warn you because this is probably not intended. To avoid the warning, make sure you’re logging in to the right account or logout from the other first.

  • Sending a copy of messages with polls will now work when possible.

  • The library now automatically retries on inter-dc call errors (which occur when Telegram has internal issues).

Bug Fixes

  • The aforementioned issue with force_document.

  • Square brackets removed from IPv6 addresses. This may fix IPv6 support.

Channel Statistics (v1.16)

Scheme layer used: 116

The newest Telegram update has a new method to also retrieve megagroup statistics, which can now be used with client.get_stats(). This way you’ll be able to access the raw data about your channel or megagroup statistics.

The maximum file size limit has also been increased to 2GB on the server, so you can send even larger files.

Breaking Changes

  • Besides the obvious layer change, the loop argument is now ignored. It has been deprecated since Python 3.8 and will be removed in Python 3.10, and also caused some annoying warning messages when using certain parts of the library. If you were (incorrectly) relying on using a different loop from the one that was set, things may break.


  • client.upload_file() now works better when streaming files (anything that has a .read()), instead of reading it all into memory when possible.

QR login (v1.15)

Published at 2020/07/04

Scheme layer used: 114

The library now has a friendly method to perform QR-login, as detailed in It won’t generate QR images, but it provides a way for you to easily do so with any other library of your choice.



Bug fixes

  • No longer crash on updates received prior to logging in.

  • Server-side changes caused clicking on inline buttons to trigger a different error, which is now handled correctly.

Minor quality of life improvements (v1.14)

Published at 2020/05/26

Scheme layer used: 113

Some nice things that were missing, along with the usual bug-fixes.


  • New Message.dice property.

  • The func= parameter of events can now be an async function.

Bug fixes

  • Fixed client.action() having an alias wrong.

  • Fixed incorrect formatting of some errors.

  • Probably more reliable detection of pin events in small groups.

  • Fixed send methods on client.conversation() were not honoring cancellation.

  • Flood waits of zero seconds are handled better.

  • Getting the pinned message in a chat was failing.

  • Fixed the return value when forwarding messages if some were missing and also the return value of albums.


  • .tgs files are now recognised as animated stickers.

  • The service message produced by is now returned.

  • Sending a file with client.send_file() now works fine when you pass an existing dice media (e.g. sending a message copy).

  • client.edit_permissions() now has the embed_links parameter which was missing.

Bug Fixes (v1.13)

Published at 2020/04/25

Scheme layer used: 112

Bug fixes and layer bump.

Bug fixes

  • Passing None as the entity to client.delete_messages() would fail.

  • When downloading a thumbnail, the name inferred was wrong.

Bug Fixes (v1.12)

Published at 2020/04/20

Scheme layer used: 111

Once again nothing major, but a few bug fixes and primarily the new layer deserves a new minor release.

Bug fixes

These were already included in the v1.11.3 patch:

  • libssl check was failing on macOS.

  • Getting input users would sometimes fail on events.ChatAction.

These bug fixes are available in this release and beyond:

  • Avoid another occurrence of MemoryError.

  • Sending large files in albums would fail because it tried to cache them.

  • The thumb was being ignored when sending files from InputFile.

  • Fixed editing inline messages from callback queries in some cases.

  • Proxy connection is now blocking which should help avoid some errors.

Bug Fixes (v1.11)

Published at 2020/02/20

Scheme layer used: 110

It has been a while since the last release, and a few bug fixes have been made since then. This release includes them and updates the scheme layer.

Note that most of the bug-fixes are available in the v1.10.10 patch.

Bug fixes

  • Fix MemoryError when casting certain media.

  • Fix client.get_entity() on small group chats.

  • client.delete_dialog() now handles deactivated chats more gracefully.

  • Sending a message with file= would ignore some of the parameters.

  • Errors are now un-pickle-able once again.

  • Fixed some issues regarding markdown and HTML (un)parsing.

The following are also present in v1.10.10:


  • Videos can now be included when sending albums.

  • Getting updates after reconnect should be more reliable.

  • Updated documentation and added more examples.

  • More security checks during the generation of the authorization key.

The following are also present in v1.10.10:

  • URLs like are now valid.

  • Auto-sleep now works for slow-mode too.

  • Improved some error messages.

  • Some internal improvements and updating.

  • client.pin_message() now also works with message objects.

  • Asynchronous file descriptors are now allowed during download and upload.

Scheduled Messages (v1.10)

Published at 2019/09/08

Scheme layer used: 105

You can now schedule messages to be sent (or edited, or forwarded…) at a later time, which can also work as reminders for yourself when used in your own chat!

from datetime import timedelta

# Remind yourself to walk the dog in 10 minutes (after you play with Telethon's update)
await client.send_message('me', 'Walk the dog',

# Remind your friend tomorrow to update Telethon
await client.send_message(friend, 'Update Telethon!',


Bug fixes

  • Fix calling flush on file objects which lack this attribute.

  • Fix CallbackQuery pattern.

  • Fix client.action() not returning itself when used in a context manager (so the as would be None).

  • Fix sending InputKeyboardButtonUrlAuth as inline buttons.

  • Fix client.edit_permissions() defaults.

  • Fix Forward had its client as None.

  • Fix (de)serialization of negative timestamps (caused by the information in some sites with instant view, where the date could be very old).

  • Fix HTML un-parsing.

  • Fix to/from_id in private messages when using multiple clients.

  • Stop disconnecting from None (incorrect logging).

  • Fix double-read on double-connect.

  • Fix client.get_messages() when being passed more than 100 IDs.

  • Fix Message.document for documents coming from web-pages.


  • Some documentation improvements, including the TL reference.

  • Documentation now avoids telethon.sync, which should hopefully be less confusing.

  • Better error messages for flood wait.

  • You can now client.get_drafts() for a single entity (which means you can now get a single draft from a single chat).

  • New-style file IDs now work with Telethon.

  • The progress_callback for client.upload_file() can now be an async def.

Animated Stickers (v1.9)

Published at 2019/07/06

Scheme layer used: 103

With the layer 103, Telethon is now able to send and receive animated stickers! These use the 'application/x-tgsticker' mime-type and for now, you can access its raw data, which is a gzipped JSON.


Bug fixes

  • Fixed downloading contacts.

  • Fixed client.iter_dialogs() missing some under certain circumstances.

  • Fixed incredibly slow imports under some systems due to expensive path resolution when searching for libssl.

  • Fixed captions when sending albums.

  • Fixed invalid states in Conversation.

  • Fixes to some methods in utils regarding extensions.

  • Fixed memory cycle in Forward which let you do things like the following:

    original_fwd = message.forward.original_fwd.original_fwd.original_fwd.original_fwd.original_fwd.original_fwd

    Hopefully you didn’t rely on that in your code.

  • Fixed File.ext not working on unknown mime-types, despite the file name having the extension.

  • Fixed ids=..., reverse=True in client.iter_messages().

  • Fixed Draft not being aware of the entity.

  • Added missing re-exports in telethon.sync.


Documentation Overhaul (v1.8)

Published at 2019/05/30

Scheme layer used: 100

The documentation has been completely reworked from the ground up, with awesome new quick references such as Client Reference to help you quickly find what you need!

Raw methods also warn you when a friendly variant is available, so that you don’t accidentally make your life harder than it has to be.

In addition, all methods in the client now are fully annotated with type hints! More work needs to be done, but this should already help a lot when using Telethon from any IDEs.

You may have noticed that the patch versions between v1.7.2 to v1.7.7 have not been documented. This is because patch versions should only contain bug fixes, no new features or breaking changes. This hasn’t been the case in the past, but from now on, the library will try to adhere more strictly to the Semantic Versioning principles.

If you ever want to look at those bug fixes, please use the appropriated git command, such as git shortlog v1.7.1...v1.7.4, but in general, they probably just fixed your issue.

With that out of the way, let’s look at the full change set:

Breaking Changes

  • The layer changed, so take note if you use the raw API, as it’s usual.

  • The way photos are downloaded changed during the layer update of the previous version, and fixing that bug as a breaking change in itself. client.download_media() now offers a different way to deal with thumbnails.


Bug fixes

  • Correctly catch and raise all RPC errors.

  • Downloading stripped photos wouldn’t work correctly.

  • Under some systems, libssl would fail to load earlier than expected, causing the library to fail when being imported.

  • conv.get_response() after ID 0 wasn’t allowed when it should.

  • InlineBuilder only worked with local files, but files from anywhere are supported.

  • Accessing the text property from a raw-API call to fetch Message would fail (any any other property that needed the client).

  • Database is now upgraded if the version was lower, not different. From now on, this should help with upgrades and downgrades slightly.

  • Fixed saving pts and session-related stuff.

  • Disconnection should not raise any errors.

  • Invite links of the form tg://join?invite= now work.

  • client.iter_participants(search=...) now works on private chats again.

  • Iterating over messages in reverse with a date as offset wouldn’t work.

  • The conversation would behave weirdly when a timeout occurred.


  • telethon now re-export all the goodies that you commonly need when using the library, so e.g. from telethon import Button will now work.

  • telethon.sync now re-exports everything from telethon, so that you can trivially import from just one place everything that you need.

  • More attempts at reducing CPU usage after automatically fetching missing entities on events. This isn’t a big deal, even if it sounds like one.

  • Hexadecimal invite links are now supported. You didn’t need them, but they will now work.

Internal Changes

  • Deterministic code generation. This is good for diff.

  • On Python 3.7 and above, we properly close the connection.

  • A lot of micro-optimization.

  • Fixes to bugs introduced while making this release.

  • Custom commands on are nicer to use.

Fix-up for Photo Downloads (v1.7.1)

Published at 2019/04/24

Telegram changed the way thumbnails (which includes photos) are downloaded, so you can no longer use a PhotoSize alone to download a particular thumbnail size (this is a breaking change).

Instead, you will have to specify the new thumb parameter in client.download_media() to download a particular thumbnail size. This addition enables you to easily download thumbnails from documents, something you couldn’t do easily before.

Easier Events (v1.7)

Published at 2019/04/22

Scheme layer used: 98

If you have been using Telethon for a while, you probably know how annoying the “Could not find the input entity for…” error can be. In this new version, the library will try harder to find the input entity for you!

That is, instead of doing:

async def handler(event):
    await client.download_profile_photo(await event.get_input_sender())
    # ...... needs await, it's a method ^^^^^                       ^^

You can now do:

async def handler(event):
    await client.download_profile_photo(event.input_sender)
    # ...... no await, it's a property! ^
    # It's also 12 characters shorter :)

And even the following will hopefully work:

async def handler(event):
    await client.download_profile_photo(event.sender_id)

A lot of people use IDs thinking this is the right way of doing it. Ideally, you would always use input_*, not sender or sender_id (and the same applies to chats). But, with this change, IDs will work just the same as input_* inside events.

This feature still needs some more testing, so please do open an issue if you find strange behaviour.

Breaking Changes

  • The layer changed, and a lot of things did too. If you are using raw API, you should be careful with this. In addition, some attributes weren’t of type datetime when they should be, which has been fixed.

  • Due to the layer change, you can no longer download photos with just their PhotoSize. Version 1.7.1 introduces a new way to download thumbnails to work around this issue.

  • client.disconnect() is now asynchronous again. This means you need to await it. You don’t need to worry about this if you were using with client or client.run_until_disconnected. This should prevent the “pending task was destroyed” errors.


  • New in-memory cache for input entities. This should mean a lot less of disk look-ups.

  • New client.action method to easily indicate that you are doing some chat action:

    async with client.action(chat, 'typing'):
        await asyncio.sleep(2)  # type for 2 seconds
        await client.send_message(chat, 'Hello world! I type slow ^^')

    You can also easily use this for sending files, playing games, etc.

New bugs

  • Downloading photos is broken. This is fixed in v1.7.1.

Bug fixes

  • Fix sending photos from streams/bytes.

  • Fix unhandled error when sending requests that were too big.

  • Fix edits that arrive too early on conversations.

  • Fix client.edit_message() when trying to edit a file.

  • Fix method calls on the objects returned by client.iter_dialogs().

  • Attempt at fixing client.iter_dialogs() missing many dialogs.

  • offset_date in client.iter_messages() was being ignored in some cases. This has been worked around.

  • Fix callback_query.edit().

  • Fix CallbackQuery(func=...) was being ignored.

  • Fix UserUpdate not working for “typing” (and uploading file, etc.) status.

  • Fix library was not expecting IOError from PySocks.

  • Fix library was raising a generic ConnectionError and not the one that actually occurred.

  • Fix the blacklist_chats parameter in MessageRead not working as intended.

  • Fix client.download_media(contact).

  • Fix mime type when sending mp3 files.

  • Fix forcibly getting the sender or chat from events would not always return all their information.

  • Fix sending albums with client.send_file() was not returning the sent messages.

  • Fix forwarding albums with client.forward_messages().

  • Some fixes regarding filtering updates from chats.

  • Attempt at preventing duplicated updates.

  • Prevent double auto-reconnect.


  • Some improvements related to proxy connections.

  • Several updates and improvements to the documentation, such as optional dependencies now being properly listed.

  • You can now forward messages from different chats directly with client.forward_messages.

Tidying up Internals (v1.6)

Published at 2019/02/27

Scheme layer used: 95

First things first, sorry for updating the layer in the previous patch version. That should only be done between major versions ideally, but due to how Telegram works, it’s done between minor versions. However raw API has and will always be considered “unsafe”, this meaning that you should always use the convenience client methods instead. These methods don’t cover the full API yet, so pull requests are welcome.

Breaking Changes

  • The layer update, of course. This didn’t really need a mention here.

  • You can no longer pass a batch_size when iterating over messages. No other method exposed this parameter, and it was only meant for testing purposes. Instead, it’s now a private constant.

  • client.iter_* methods no longer have a _total parameter which was supposed to be private anyway. Instead, they return a new generator object which has a .total attribute:

    it = client.iter_messages(chat)
    for i, message in enumerate(it, start=1):
        percentage = i /
        print('{:.2%} {}'.format(percentage, message.text))


  • You can now pass phone and phone_code_hash in client.sign_up, although you probably don’t need that.

  • Thanks to the overhaul of all client.iter_* methods, you can now do:

    for message in reversed(client.iter_messages('me')):

Bug fixes


  • Cleared up some parts of the documentation.

  • Improved some auto-casts to make life easier.

  • Improved image detection. Now you can easily send bytes and streams of images as photos, unless you force document.

  • Sending images as photos that are too large will now be resized before uploading, reducing the time it takes to upload them and also avoiding errors when the image was too large (as long as pillow is installed). The images will remain unchanged if you send it as a document.

  • Treat errors.RpcMcgetFailError as a temporary server error to automatically retry shortly. This works around most issues.

Internal changes

  • New common way to deal with retries (retry_range).

  • Cleaned up the takeout client.

  • Completely overhauled asynchronous generators.

Layer Update (v1.5.5)

Published at 2019/01/14

Scheme layer used: 93

There isn’t an entry for v1.5.4 because it contained only one hot-fix regarding loggers. This update is slightly bigger so it deserves mention.


Bug fixes

  • Dealing with mimetypes should cause less issues in systems like Windows.

  • Potentially fix alternative session storages that had issues with dates.


  • Saner timeout defaults for conversations.

  • Path-like files are now supported for thumbnails.

  • Added new hot-keys to the online documentation at such as / to search. Press ? to view them all.

Bug Fixes (v1.5.3)

Published at 2019/01/14

Several bug fixes and some quality of life enhancements.

Breaking Changes

  • message.edit now respects the previous message buttons or link preview being hidden. If you want to toggle them you need to explicitly set them. This is generally the desired behaviour, but may cause some bots to have buttons when they shouldn’t.


  • You can now “hide_via” when clicking on results from client.inline_query to @bing and @gif.

  • You can now further configure the logger Telethon uses to suit your needs.

Bug fixes

  • Fixes for ReadTheDocs to correctly build the documentation.

  • Fix UserEmpty not being expected when getting the input variant.

  • The message object returned when sending a message with buttons wouldn’t always contain the ReplyMarkup.

  • Setting email when configuring 2FA wasn’t properly supported.

  • utils.resolve_bot_file_id now works again for photos.


Takeout Sessions (v1.5.2)

Published at 2019/01/05

You can now easily start takeout sessions (also known as data export sessions) through client.takeout(). Some of the requests will have lower flood limits when done through the takeout session.

Bug fixes

  • The new AdminLogEvent had a bug that made it unusable.

  • client.iter_dialogs() will now locally check for the offset date, since Telegram ignores it.

  • Answering inline queries with media no works properly. You can now use the library to create inline bots and send stickers through them!

object.to_json() (v1.5.1)

Published at 2019/01/03

The library already had a way to easily convert the objects the API returned into dictionaries through object.to_dict(), but some of the fields are dates or bytes which JSON can’t serialize directly.

For convenience, a new object.to_json() has been added which will by default format both of those problematic types into something sensible.


Bug fixes

  • client.is_connected() would be wrong when the initial connection failed.

  • Fixed UnicodeDecodeError when accessing the text of messages with malformed offsets in their entities.

  • Fixed client.get_input_entity() for integer IDs that the client has not seen before.


  • You can now configure the reply markup when using Button as a bot.

  • More properties for Message to make accessing media convenient.

  • Downloading to file=bytes will now return a bytes object with the downloaded media.

Polls with the Latest Layer (v1.5)

Published at 2018/12/25

Scheme layer used: 91

This version doesn’t really bring many new features, but rather focuses on updating the code base to support the latest available Telegram layer, 91. This layer brings polls, and you can create and manage them through Telethon!

Breaking Changes

  • The layer change from 82 to 91 changed a lot of things in the raw API, so be aware that if you rely on raw API calls, you may need to update your code, in particular if you work with files. They have a new file_reference parameter that you must provide.


Bug fixes

  • Markdown and HTML parsing now behave correctly with leading whitespace.

  • HTTP connection should now work correctly again.

  • Using caption=None would raise an error instead of setting no caption.

  • KeyError is now handled properly when forwarding messages.

  • now works as expected for KeyboardButtonGame.


  • Some improvements to the search in the full API and generated examples.

  • Using entities with access_hash = 0 will now work in more cases.

Internal changes

  • Some changes to the documentation and code generation.

  • 2FA code was updated to work under the latest layer.

Error Descriptions in CSV files (v1.4.3)

Published at 2018/12/04

While this may seem like a minor thing, it’s a big usability improvement.

Anyone who wants to update the documentation for known errors, or whether some methods can be used as a bot, user or both, can now be easily edited. Everyone is encouraged to help document this better!

Bug fixes

  • TimeoutError was not handled during automatic reconnects.

  • Getting messages by ID using InputMessageReplyTo could fail.

  • Fixed message.get_reply_message as a bot when a user replied to a different bot.

  • Accessing some document properties in a Message would fail.


  • Accessing events.ChatAction properties such as input users may now work in more cases.

Internal changes

  • Error descriptions and information about methods is now loaded from a CSV file instead of being part of several messy JSON files.

Bug Fixes (v1.4.2)

Published at 2018/11/24

This version also includes the v1.4.1 hot-fix, which was a single quick fix and didn’t really deserve an entry in the changelog.

Bug fixes

  • Authorization key wouldn’t be saved correctly, requiring re-login.

  • Conversations with custom events failed to be cancelled.

  • Fixed telethon.sync when using other threads.

  • Fix markdown/HTML parser from failing with leading/trailing whitespace.

  • Fix accessing chat_action_event.input_user property.

  • Potentially improved handling unexpected disconnections.


  • Better default behaviour for client.send_read_acknowledge.

  • Clarified some points in the documentation.

  • Clearer errors for utils.get_peer*.

Connection Overhaul (v1.4)

Published at 2018/11/03

Yet again, a lot of work has been put into reworking the low level connection classes. This means asyncio.open_connection is now used correctly and the errors it can produce are handled properly. The separation between packing, encrypting and network is now abstracted away properly, so reasoning about the code is easier, making it more maintainable.

As a user, you shouldn’t worry about this, other than being aware that quite a few changes were made in the insides of the library and you should report any issues that you encounter with this version if any.

Breaking Changes

  • The threaded version of the library will no longer be maintained, primarily because it never was properly maintained anyway. If you have old code, stick with old versions of the library, such as

  • Timeouts no longer accept timedelta. Simply use seconds.

  • The callback parameter from was removed, since it had always been a bad idea. Adding the callback there meant a lot of extra work for every message sent, and only registering it after the first message was sent! Instead, use


Bug fixes


  • Support next_offset in inline_query.answer().

  • Support <a href="tg://user?id=123"> mentions in HTML parse mode.

  • New auto-casts for InputDocument and InputChatPhoto.

  • Conversations are now exclusive per-chat by default.

  • The request that caused a RPC error is now shown in the error message.

  • New full API examples in the generated documentation.

  • Fixed some broken links in the documentation.

  • client.disconnect() is now synchronous, but you can still await it for consistency or compatibility.

Event Templates (v1.3)

Published at 2018/09/22

If you have worked with Flask templates, you will love this update, since it gives you the same features but even more conveniently:

# handlers/
from telethon import events

async def handler(event):
    client = event.client
    await event.respond('Hi!')
    await client.send_message('me', 'Sent hello to someone')

This will register the handler callback to handle new message events. Note that you didn’t add this to any client yet, and this is the key point: you don’t need a client to define handlers! You can add it later:

from telethon import TelegramClient
import handlers.welcome

with TelegramClient(...) as client:
    # This line adds the handler we defined before for new messages

This should help you to split your big code base into a more modular design.

Breaking Changes

  • .sender is the .chat when the message is sent in a broadcast channel. This makes sense, because the sender of the message was the channel itself, but you now must take into consideration that it may be either a User or Channel instead of being None.


  • New MultiError class when invoking many requests at once through client([requests]).

  • New custom func= on all events. These will receive the entire event, and a good usage example is func=lambda e: e.is_private.

  • New .web_preview field on messages. The .photo and .document will also return the media in the web preview if any, for convenience.

  • Callback queries now have a .chat in most circumstances.

Bug fixes

  • Running code with python3 -O would remove critical code from asserts.

  • Fix some rare ghost disconnections after reconnecting.

  • Fix strange behavior for send_message(chat, Message, reply_to=foo).

  • The loop= argument was being pretty much ignored.

  • Fix MemorySession file caching.

  • The logic for getting entities from their username is now correct.

  • Fixes for sending stickers from .webp files in Windows, again.

  • Fix disconnection without being logged in.

  • Retrieving media from messages would fail.

  • Getting some messages by ID on private chats.


  • iter_participants will now use its search= as a symbol set when aggressive=True, so you can do client.get_participants(group, aggressive=True, search='абвгдеёжзийклмнопрст').

  • The StringSession supports custom encoding.

  • Callbacks for telethon.client.auth.AuthMethods.start can be async.

Internal changes

  • Cherry-picked a commit to use asyncio.open_connection in the lowest level of the library. Do open issues if this causes trouble, but it should otherwise improve performance and reliability.

  • Building and resolving events overhaul.

Conversations, String Sessions and More (v1.2)

Published at 2018/08/14

This is a big release! Quite a few things have been added to the library, such as the new Conversation. This makes it trivial to get tokens from @BotFather:

from import types

with client.conversation('BotFather') as conv:
    message = conv.get_response()
    message = conv.get_edit()
    message = conv.get_edit()
    for _, token in message.get_entities_text(types.MessageEntityCode):

In addition to that, you can now easily load and export session files without creating any on-disk file thanks to the StringSession:

from telethon.sessions import StringSession
string =

Check out Session Files for more details.

For those who aren’t able to install cryptg, the support for libssl has been added back. While interfacing libssl is not as fast, the speed when downloading and sending files should really be noticeably faster.

While those are the biggest things, there are still more things to be excited about.


Bug fixes

  • UTC timezone for

  • Bug with certain input parameters when iterating messages.

  • RPC errors without parent requests caused a crash, and better logging.

  • incoming = outgoing = True was not working properly.

  • Getting a message’s ID was not working.

  • File attributes not being inferred for open()’ed files.

  • Use MemorySession if sqlite3 is not installed by default.

  • Self-user would not be saved to the session file after signing in.

  • client.catch_up() seems to be functional again.


  • Updated documentation.

  • Invite links will now use cache, so using them as entities is cheaper.

  • You can reuse message buttons to send new messages with those buttons.

  • .to_dict() will now work even on invalid TLObject’s.

Better Custom Message (v1.1.1)

Published at 2018/07/23

The custom.Message class has been rewritten in a cleaner way and overall feels less hacky in the library. This should perform better than the previous way in which it was patched.

The release is primarily intended to test this big change, but also fixes Python 3.5.2 compatibility which was broken due to a trailing comma.

Bug fixes

  • Using functools.partial on event handlers broke updates if they had uncaught exceptions.

  • A bug under some session files where the sender would export authorization for the same data center, which is unsupported.

  • Some logical bugs in the custom message class.

Bot Friendly (v1.1)

Published at 2018/07/21

Two new event handlers to ease creating normal bots with the library, namely events.InlineQuery and events.CallbackQuery for handling @InlineBot queries or reacting to a button click. For this second option, there is an even better way:

from import Button

async def callback(event):
    await event.edit('Thank you!')

bot.send_message(chat, 'Hello!',
                 buttons=Button.inline('Click me', callback))

You can directly pass the callback when creating the button.

This is fine for small bots but it will add the callback every time you send a message, so you probably should do this instead once you are done testing:

markup = bot.build_reply_markup(Button.inline('Click me', callback))
bot.send_message(chat, 'Hello!', buttons=markup)

And yes, you can create more complex button layouts with lists:

from telethon import events

global phone = ''

async def handler(event):
    global phone
    if == b'<':
        phone = phone[:-1]
        phone +='utf-8')

    await event.answer('Phone is now {}'.format(phone))

markup = bot.build_reply_markup([
    [Button.inline('1'), Button.inline('2'), Button.inline('3')],
    [Button.inline('4'), Button.inline('5'), Button.inline('6')],
    [Button.inline('7'), Button.inline('8'), Button.inline('9')],
    [Button.inline('+'), Button.inline('0'), Button.inline('<')],
bot.send_message(chat, 'Enter a phone', buttons=markup)

(Yes, there are better ways to do this). Now for the rest of things:


  • New custom.Button class to help you create inline (or normal) reply keyboards. You must sign in as a bot to use the buttons= parameters.

  • New events usable if you sign in as a bot: events.InlineQuery and events.CallbackQuery.

  • New silent parameter when sending messages, usable in broadcast channels.

  • Documentation now has an entire section dedicate to how to use the client’s friendly methods at (removed broken link).

Bug fixes

  • Empty except are no longer used which means sending a keyboard interrupt should now work properly.

  • The pts of incoming updates could be None.

  • UTC timezone information is properly set for read datetime.

  • Some infinite recursion bugs in the custom message class.

  • Updates was being dispatched to raw handlers when it shouldn’t.

  • Using proxies and HTTPS connection mode may now work properly.

  • Less flood waits when downloading media from different data centers, and the library will now detect them even before sending requests.


  • Interactive sign in now supports signing in with a bot token.

  • timedelta is now supported where a date is expected, which means you can e.g. ban someone for timedelta(minutes=5).

  • Events are only built once and reused many times, which should save quite a few CPU cycles if you have a lot of the same type.

  • You can now click inline buttons directly if you know their data.

Internal changes

  • When downloading media, the right sender is directly used without previously triggering migrate errors.

  • Code reusing for getting the chat and the sender, which easily enables this feature for new types.

New HTTP(S) Connection Mode (v1.0.4)

Published at 2018/07/09

This release implements the HTTP connection mode to the library, which means certain proxies that only allow HTTP connections should now work properly. You can use it doing the following, like any other mode:

from telethon import TelegramClient, sync
from import ConnectionHttp

client = TelegramClient(..., connection=ConnectionHttp)
with client:
    client.send_message('me', 'Hi!')


Bug fixes

  • If several TLMessage in a MessageContainer exceeds 1MB, it will no longer be automatically turned into one. This basically means that e.g. uploading 10 file parts at once will work properly again.

  • Documentation fixes and some missing await.

  • Revert named argument for client.forward_messages


Internal changes

  • Outgoing TLMessage are now pre-packed so if there’s an error when serializing the raw requests, the library will no longer swallow it. This also means re-sending packets doesn’t need to re-pack their bytes.

Iterate Messages in Reverse (v1.0.3)

Published at 2018/07/04

Scheme layer used: 82

Mostly bug fixes, but now there is a new parameter on client.iter_messages to support reversing the order in which messages are returned.


  • The mentioned reverse parameter when iterating over messages.

  • A new sequential_updates parameter when creating the client for updates to be processed sequentially. This is useful when you need to make sure that all updates are processed in order, such as a script that only forwards incoming messages somewhere else.

Bug fixes

  • Count was always None for message.button_count.

  • Some fixes when disconnecting upon dropping the client.

  • Support for Python 3.4 in the sync version, and fix media download.

  • Some issues with events when accessing the input chat or their media.

  • Hachoir wouldn’t automatically close the file after reading its metadata.

  • Signing in required a named code= parameter, but usage without a name was really widespread so it has been reverted.

Bug Fixes (v1.0.2)

Published at 2018/06/28

Updated some asserts and parallel downloads, as well as some fixes for sync.

Bug Fixes (v1.0.1)

Published at 2018/06/27

And as usual, every major release has a few bugs that make the library unusable! This quick update should fix those, namely:

Bug fixes

  • client.start() was completely broken due to a last-time change requiring named arguments everywhere.

  • Since the rewrite, if your system clock was wrong, the connection would get stuck in an infinite “bad message” loop of responses from Telegram.

  • Accessing the buttons of a custom message wouldn’t work in channels, which lead to fix a completely different bug regarding starting bots.

  • Disconnecting could complain if the magic telethon.sync was imported.

  • Successful automatic reconnections now ask Telegram to send updates to us once again as soon as the library is ready to listen for them.

Synchronous magic (v1.0)

Published at 2018/06/27


If you come from Telethon pre-1.0 you really want to read Compatibility and Convenience to port your scripts to the new version.

The library has been around for well over a year. A lot of improvements have been made, a lot of user complaints have been fixed, and a lot of user desires have been implemented. It’s time to consider the public API as stable, and remove some of the old methods that were around until now for compatibility reasons. But there’s one more surprise!

There is a new magic telethon.sync module to let you use all the methods in the TelegramClient (and the types returned from its functions) in a synchronous way, while using asyncio behind the scenes! This means you’re now able to do both of the following:

import asyncio

async def main():
  await client.send_message('me', 'Hello!')

# ...can be rewritten as:

from telethon import sync
client.send_message('me', 'Hello!')

Both ways can coexist (you need to await if the loop is running).

You can also use the magic sync module in your own classes, and call sync.syncify(cls) to convert all their async def into magic variants.

Breaking Changes

  • message.get_fwd_sender is now in message.forward.

  • client.idle is now client.run_until_disconnected()

  • client.add_update_handler is now client.add_event_handler

  • client.remove_update_handler is now client.remove_event_handler

  • client.list_update_handlers is now client.list_event_handlers

  • client.get_message_history is now client.get_messages

  • client.send_voice_note is now client.send_file with is_voice=True.

  • client.invoke() is now client(...).

  • report_errors has been removed since it’s currently not used, and flood_sleep_threshold is now part of the client.

  • The update_workers and spawn_read_thread arguments are gone. Simply remove them from your code when you create the client.

  • Methods with a lot of arguments can no longer be used without specifying their argument. Instead you need to use named arguments. This improves readability and not needing to learn the order of the arguments, which can also change.


  • client.send_file now accepts external http:// and https:// URLs.

  • You can use the TelegramClient inside of with blocks, which will client.start() and disconnect() the client for you:

    from telethon import TelegramClient, sync
    with TelegramClient(name, api_id, api_hash) as client:
        client.send_message('me', 'Hello!')

    Convenience at its maximum! You can even chain the .start() method since it returns the instance of the client:

    with TelegramClient(name, api_id, api_hash).start(bot_token=token) as bot:
        bot.send_message(chat, 'Hello!')

Bug fixes

  • There were some @property async def left, and some await property.

  • “User joined” event was being treated as “User was invited”.

  • SQLite’s cursor should not be closed properly after usage.

  • await the updates task upon disconnection.

  • Some bug in Python 3.5.2’s asyncio causing 100% CPU load if you forgot to call client.disconnect(). The method is called for you on object destruction, but you still should disconnect manually or use a with block.

  • Some fixes regarding disconnecting on client deletion and properly saving the authorization key.

  • Passing a class to message.get_entities_text now works properly.

  • Iterating messages from a specific user in private messages now works.


Core Rewrite in asyncio (v1.0-rc1)

Published at 2018/06/24

Scheme layer used: 81

This version is a major overhaul of the library internals. The core has been rewritten, cleaned up and refactored to fix some oddities that have been growing inside the library.

This means that the code is easier to understand and reason about, including the code flow such as conditions, exceptions, where to reconnect, how the library should behave, and separating different retry types such as disconnections or call fails, but it also means that some things will necessarily break in this version.

All requests that touch the network are now methods and need to have their await (or be ran until their completion).

Also, the library finally has the simple logo it deserved: a carefully hand-written .svg file representing a T following Python’s colours.

Breaking Changes

  • If you relied on internals like the MtProtoSender and the TelegramBareClient, both are gone. They are now MTProtoSender and TelegramBaseClient and they behave differently.

  • Underscores have been renamed from filenames. This means telethon.errors.rpc_error_list won’t work, but you should have been using telethon.errors all this time instead.

  • client.connect no longer returns True on success. Instead, you should except the possible ConnectionError and act accordingly. This makes it easier to not ignore the error.

  • You can no longer set retries=n when calling a request manually. The limit works differently now, and it’s done on a per-client basis.

  • Accessing .sender, .chat and similar may not work in events anymore, since previously they could access the network. The new rule is that properties are not allowed to make API calls. You should use .get_sender(), .get_chat() instead while using events. You can safely access properties if you get messages through client.get_messages() or other methods in the client.

  • The above point means reply_message is now .get_reply_message(), and fwd_from_entity is now get_fwd_sender(). Also forward was gone in the previous version, and you should be using fwd_from instead.


  • Telegram’s Terms Of Service are now accepted when creating a new account. This can possibly help avoid bans. This has no effect for accounts that were created before.

  • The method reference now shows which methods can be used if you sign in with a bot_token.

  • There’s a new client.disconnected future which you can wait on. When a disconnection occurs, you will now, instead letting it happen in the background.

  • More configurable retries parameters, such as auto-reconnection, retries when connecting, and retries when sending a request.

  • You can filter events.NewMessage by sender ID, and also whether they are forwards or not.

  • New ignore_migrated parameter for client.iter_dialogs.

Bug fixes

  • Several fixes to

  • Removed named length argument in to_bytes for PyPy.

  • Raw events failed due to not having ._set_client.

  • message.get_entities_text properly supports filtering, even if there are no message entities.

  • works better.

  • The server started sending DraftMessageEmpty which the library didn’t handle correctly when getting dialogs.

  • The “correct” chat is now always returned from returned messages.

  • to_id was not validated when retrieving messages by their IDs.

  • '__' is no longer considered valid in usernames.

  • The fd is removed from the reader upon closing the socket. This should be noticeable in Windows.

  • MessageEmpty is now handled when searching messages.

  • Fixed a rare infinite loop bug in client.iter_dialogs for some people.

  • Fixed TypeError when there is no .sender.


  • You can now delete over 100 messages at once with client.delete_messages.

  • Signing in now accounts for AuthRestartError itself, and also handles PasswordHashInvalidError.

  • __all__ is now defined, so from telethon import * imports sane defaults (client, events and utils). This is however discouraged and should be used only in quick scripts.

  • pathlib.Path is now supported for downloading and uploading media.

  • Messages you send to yourself are now considered outgoing, unless they are forwarded.

  • The documentation has been updated with a brand new asyncio crash course to encourage you use it. You can still use the threaded version if you want though.

  • .name property is now properly supported when sending and downloading files.

  • Custom parse_mode, which can now be set per-client, support MessageEntityMentionName so you can return those now.

  • The session file is saved less often, which could result in a noticeable speed-up when working with a lot of incoming updates.

Internal changes

  • The flow for sending a request is as follows: the TelegramClient creates a MTProtoSender with a Connection, and the sender starts send and receive loops. Sending a request means enqueueing it in the sender, which will eventually pack and encrypt it with its ConnectionState instead of using the entire Session instance. When the data is packed, it will be sent over the Connection and ultimately over the TcpClient.

  • Reconnection occurs at the MTProtoSender level, and receiving responses follows a similar process, but now asyncio.Future is used for the results which are no longer part of all TLObject, instead are part of the TLMessage which simplifies things.

  • Objects can no longer be content_related and instead subclass TLRequest, making the separation of concerns easier.

  • The TelegramClient has been split into several mixin classes to avoid having a 3,000-lines-long file with all the methods.

  • More special cases in the MTProtoSender have been cleaned up, and also some attributes from the Session which didn’t really belong there since they weren’t being saved.

  • The telethon_generator/ can now convert .tl files into .json, mostly as a proof of concept, but it might be useful for other people.

Custom Message class (v0.19.1)

Published at 2018/06/03

Scheme layer used: 80

This update brings a new object!

All the methods in the telethon.telegram_client.TelegramClient that used to return a Message will now return this object instead, which means you can do things like the following:

msg = client.send_message(chat, 'Hello!')
msg.edit('Hello there!')
msg.reply('Good day!')

Refer to its documentation to see all you can do, again, click to go to its page.

Breaking Changes


  • You can get messages by their ID with telethon.telegram_client.TelegramClient.get_messages’s ids parameter:

    message = client.get_messages(chats, ids=123)  # Single message
    message_list = client.get_messages(chats, ids=[777, 778])  # Multiple
  • More convenience properties for

  • New default telethon.telegram_client.TelegramClient.parse_mode.

  • You can edit the media of messages that already have some media.

  • New dark theme in the online tl reference, check it out at

Bug fixes

  • Some IDs start with 1000 and these would be wrongly treated as channels.

  • Some short usernames like @vote were being ignored.

  • telethon.telegram_client.TelegramClient.iter_messages’s from_user was failing if no filter had been set.

  • telethon.telegram_client.TelegramClient.iter_messages’s min_id/max_id was being ignored by Telegram. This is now worked around.

  • telethon.telegram_client.TelegramClient.catch_up would fail with empty states.

  • supports incoming=False to indicate outgoing=True.


  • You can now send multiple requests at once while preserving the order:

    from import SendMessageRequest
    client([SendMessageRequest(chat, 'Hello 1!'),
            SendMessageRequest(chat, 'Hello 2!')], ordered=True)

Internal changes

  • without rowid is not used in SQLite anymore.

  • Unboxed serialization would fail.

  • Different default limit for iter_messages and get_messages.

  • Some clean-up in the telethon_generator/ package.

Catching up on Updates (v0.19)

Published at 2018/05/07

Scheme layer used: 76

This update prepares the library for catching up with updates with the new telethon.telegram_client.TelegramClient.catch_up method. This feature needs more testing, but for now it will let you “catch up” on some old updates that occurred while the library was offline, and brings some new features and bug fixes.


  • Add search, filter and from_user parameters to telethon.telegram_client.TelegramClient.iter_messages.

  • telethon.telegram_client.TelegramClient.download_file now supports a None path to return the file in memory and return its bytes.

  • Events now have a .original_update field.

Bug fixes

  • Fixed a race condition when receiving items from the network.

  • A disconnection is made when “retries reached 0”. This hasn’t been tested but it might fix the bug.

  • reply_to would not override Message object’s reply value.

  • Add missing caption when sending Message with media.


  • Retry automatically on RpcCallFailError. This error happened a lot when iterating over many messages, and retrying often fixes it.

  • Faster telethon.telegram_client.TelegramClient.iter_messages by sleeping only as much as needed.

  • telethon.telegram_client.TelegramClient.edit_message now supports omitting the entity if you pass a Message.

  • can now be filtered by type.

Internal changes

  • The library now distinguishes between MTProto and API schemas.

  • State is now persisted to the session file.

  • Connection won’t retry forever.

  • Fixed some errors and cleaned up the generation of code.

  • Fixed typos and enhanced some documentation in general.

  • Add auto-cast for InputMessage and InputLocation.

Pickle-able objects (v0.18.3)

Published at 2018/04/15

Now you can use Python’s pickle module to serialize RPCError and any other TLObject thanks to @vegeta1k95! A fix that was fairly simple, but still might be useful for many people.

As a side note, the documentation at now lists known RPCError for all requests, so you know what to expect. This required a major rewrite, but it was well worth it!

Breaking changes

  • telethon.telegram_client.TelegramClient.forward_messages now returns a single item instead of a list if the input was also a single item.


Bug fixes

  • Possibly fix some bug regarding lost GzipPacked requests.

  • The library now uses the “real” layer 75, hopefully.

  • Fixed .entities name collision on updates by making it private.

  • AUTH_KEY_DUPLICATED is handled automatically on connection.

  • Markdown parser’s offset uses match.start() to allow custom regex.

  • Some filter types (as a type) were not supported by telethon.telegram_client.TelegramClient.iter_participants.

  • telethon.telegram_client.TelegramClient.remove_event_handler works.

  • telethon.telegram_client.TelegramClient.start works on all terminals.

  • InputPeerSelf case was missing from telethon.telegram_client.TelegramClient.get_input_entity.


  • The parse_mode for messages now accepts a callable.

  • telethon.telegram_client.TelegramClient.download_media accepts web previews.

  • instances can now be casted into InputPeer.

  • Better logging when reading packages “breaks”.

  • Better and more powerful gen command.

Internal changes

  • The library won’t call .get_dialogs() on entity not found. Instead, it will raise ValueError() so you can properly except it.

  • Several new examples and updated documentation.

  • py:obj is the default Sphinx’s role which simplifies .rst files.

  • now makes use of python_requires.

  • Events now live in separate files.

  • Other minor changes.

Several bug fixes (v0.18.2)

Published at 2018/03/27

Just a few bug fixes before they become too many.


  • Getting an entity by its positive ID should be enough, regardless of their type (whether it’s an User, a Chat or a Channel). Although wrapping them inside a Peer is still recommended, it’s not necessary.

  • New client.edit_2fa function to change your Two Factor Authentication settings.

  • .stringify() and string representation for custom Dialog/Draft.

Bug fixes

  • Some bug regarding .get_input_peer.

  • events.ChatAction wasn’t picking up all the pins.

  • force_document=True was being ignored for albums.

  • Now you’re able to send Photo and Document as files.

  • Wrong access to a member on chat forbidden error for .get_participants. An empty list is returned instead.

  • me/self check for .get[_input]_entity has been moved up so if someone has “me” or “self” as their name they won’t be retrieved.

Iterator methods (v0.18.1)

Published at 2018/03/17

All the .get_ methods in the TelegramClient now have a .iter_ counterpart, so you can do operations while retrieving items from them. For instance, you can client.iter_dialogs() and break once you find what you’re looking for instead fetching them all at once.

Another big thing, you can get entities by just their positive ID. This may cause some collisions (although it’s very unlikely), and you can (should) still be explicit about the type you want. However, it’s a lot more convenient and less confusing.

Breaking changes

  • The library only offers the default SQLiteSession again. See Session Files for more on how to use a different storage from now on.


  • Events now override __str__ and implement .stringify(), just like every other TLObject does.

  • events.ChatAction now has respond(), reply() and delete() for the message that triggered it.

  • client.iter_participants() (and its client.get_participants() counterpart) now expose the filter argument, and the returned users also expose the .participant they are.

  • You can now use client.remove_event_handler() and client.list_event_handlers() similar how you could with normal updates.

  • New properties on events.NewMessage, like .video_note and .gif to access only specific types of documents.

  • The Draft class now exposes .text and .raw_text, as well as a new Draft.send() to send it.

Bug fixes

  • MessageEdited was ignoring NewMessage constructor arguments.

  • Fixes for Event.delete_messages which wouldn’t handle MessageService.

  • Bot API style IDs not working on client.get_input_entity().

  • client.download_media() didn’t support PhotoSize.


  • Less RPC are made when accessing the .sender and .chat of some events (mostly those that occur in a channel).

  • You can send albums larger than 10 items (they will be sliced for you), as well as mixing normal files with photos.

  • TLObject now have Python type hints.

Internal changes

  • Several documentation corrections.

  • client.get_dialogs() is only called once again when an entity is not found to avoid flood waits.

Sessions overhaul (v0.18)

Published at 2018/03/04

Scheme layer used: 75

The Session’s have been revisited thanks to the work of @tulir and they now use an ABC so you can easily implement your own!

The default will still be a SQLiteSession, but you might want to use the new AlchemySessionContainer if you need. Refer to the section of the documentation on Session Files for more.

Breaking changes

  • events.MessageChanged doesn’t exist anymore. Use the new events.MessageEdited and events.MessageDeleted instead.


  • The mentioned addition of new session types.

  • You can omit the event type on client.add_event_handler to use Raw.

  • You can raise StopPropagation of events if you added several of them.

  • .get_participants() can now get up to 90,000 members from groups with 100,000 if when aggressive=True, “bypassing” Telegram’s limit.

  • You now can access NewMessage.Event.pattern_match.

  • Multiple captions are now supported when sending albums.

  • client.send_message() has an optional file= parameter, so you can do events.reply(file='/path/to/photo.jpg') and similar.

  • Added .input_ versions to events.ChatAction.

  • You can now access the public .client property on events.

  • New client.forward_messages, with its own wrapper on events, called event.forward_to(...).

Bug fixes

  • Silly bug regarding client.get_me(input_peer=True).

  • client.send_voice_note() was missing some parameters.

  • client.send_file() plays better with streams now.

  • Incoming messages from bots weren’t working with whitelists.

  • Markdown’s URL regex was not accepting newlines.

  • Better attempt at joining background update threads.

  • Use the right peer type when a marked integer ID is provided.

Internal changes

  • Resolving events.Raw is now a no-op.

  • Logging calls in the TcpClient to spot errors.

  • events resolution is postponed until you are successfully connected, so you can attach them before starting the client.

  • When an entity is not found, it is searched in all dialogs. This might not always be desirable but it’s more comfortable for legitimate uses.

  • Some non-persisting properties from the Session have been moved out.

Further easing library usage (v0.17.4)

Published at 2018/02/24

Some new things and patches that already deserved their own release.


  • New pattern argument to NewMessage to easily filter messages.

  • New .get_participants() convenience method to get members from chats.

  • .send_message() now accepts a Message as the message parameter.

  • You can now .get_entity() through exact name match instead username.

  • Raise ProxyConnectionError instead looping forever so you can except it on your own code and behave accordingly.

Bug fixes

  • .parse_username would fail with www. or a trailing slash.

  • events.MessageChanged would fail with UpdateDeleteMessages.

  • You can now send b'byte strings' directly as files again.

  • .send_file() was not respecting the original captions when passing another message (or media) as the file.

  • Downloading media from a different data center would always log a warning for the first time.

Internal changes

  • Use req_pq_multi instead req_pq when generating auth_key.

  • You can use .get_me(input_peer=True) if all you need is your self ID.

  • New addition to the interactive client example to show peer information.

  • Avoid special casing InputPeerSelf on some NewMessage events, so you can always safely rely on .sender to get the right ID.

New small convenience functions (v0.17.3)

Published at 2018/02/18

More bug fixes and a few others addition to make events easier to use.


  • Use hachoir to extract video and audio metadata before upload.

  • New .add_event_handler, .add_update_handler now deprecated.

Bug fixes

  • bot_token wouldn’t work on .start(), and changes to password (now it will ask you for it if you don’t provide it, as docstring hinted).

  • .edit_message() was ignoring the formatting (e.g. markdown).

  • Added missing case to the NewMessage event for normal groups.

  • Accessing the .text of the NewMessage event was failing due to a bug with the markdown unparser.

Internal changes

New small convenience functions (v0.17.2)

Published at 2018/02/15

Primarily bug fixing and a few welcomed additions.


  • New convenience .edit_message() method on the TelegramClient.

  • New .edit() and .delete() shorthands on the NewMessage event.

  • Default to markdown parsing when sending and editing messages.

  • Support for inline mentions when sending and editing messages. They work like inline urls (e.g. [text](@username)) and also support the Bot-API style (see here).

Bug fixes

  • Periodically send GetStateRequest automatically to keep the server sending updates even if you’re not invoking any request yourself.

  • HTML parsing was failing due to not handling surrogates properly.

  • .sign_up was not accepting int codes.

  • Whitelisting more than one chat on events wasn’t working.

  • Video files are sent as a video by default unless force_document.

Internal changes

  • More logging calls to help spot some bugs in the future.

  • Some more logic to retrieve input entities on events.

  • Clarified a few parts of the documentation.

Updates as Events (v0.17.1)

Published at 2018/02/09

Of course there was more work to be done regarding updates, and it’s here! The library comes with a new events module (which you will often import as from telethon import TelegramClient, events). This are pretty much all the additions that come with this version change, but they are a nice addition. Refer to (removed broken link) to get started with events.

Trust the Server with Updates (v0.17)

Published at 2018/02/03

The library trusts the server with updates again. The library will not check for duplicates anymore, and when the server kicks us, it will run GetStateRequest so the server starts sending updates again (something it wouldn’t do unless you invoked something, it seems). But this update also brings a few more changes!


  • TLObject’s override __eq__ and __ne__, so you can compare them.

  • Added some missing cases on .get_input_entity() and peer functions.

  • obj.to_dict() now has a '_' key with the type used.

  • .start() can also sign up now.

  • More parameters for .get_message_history().

  • Updated list of RPC errors.

  • HTML parsing thanks to @tulir! It can be used similar to markdown: client.send_message(..., parse_mode='html').


  • client.send_file() now accepts Message’s and MessageMedia’s as the file parameter.

  • Some documentation updates and fixed to clarify certain things.

  • New exact match feature on

  • Return as early as possible from .get_input_entity() and similar, to avoid penalizing you for doing this right.

Bug fixes

  • .download_media() wouldn’t accept a Document as parameter.

  • The SQLite is now closed properly on disconnection.

  • IPv6 addresses shouldn’t use square braces.

  • Fix regarding .log_out().

  • The time offset wasn’t being used (so having wrong system time would cause the library not to work at all).

New .resolve() method (v0.16.2)

Published at 2018/01/19

The TLObject’s (instances returned by the API and Request’s) have now acquired a new .resolve() method. While this should be used by the library alone (when invoking a request), it means that you can now use Peer types or even usernames where a InputPeer is required. The object now has access to the client, so that it can fetch the right type if needed, or access the session database. Furthermore, you can reuse requests that need “autocast” (e.g. you put User but InputPeer was needed), since .resolve() is called when invoking. Before, it was only done on object construction.


  • Album support. Just pass a list, tuple or any iterable to .send_file().


  • .start() asks for your phone only if required.

  • Better file cache. All files under 10MB, once uploaded, should never be needed to be re-uploaded again, as the sent media is cached to the session.

Bug fixes

  • now calls gen_tl when installing the library if needed.

Internal changes

  • The mentioned .resolve() to perform “autocast”, more powerful.

  • Upload and download methods are no longer part of TelegramBareClient.

  • Reuse .on_response(), .__str__ and .stringify(). Only override .on_response() if necessary (small amount of cases).

  • Reduced “autocast” overhead as much as possible. You shouldn’t be penalized if you’ve provided the right type.

MtProto 2.0 (v0.16.1)

Published at 2018/01/11

Scheme layer used: 74

The library is now using MtProto 2.0! This shouldn’t really affect you as an end user, but at least it means the library will be ready by the time MtProto 1.0 is deprecated.


  • New .start() method, to make the library avoid boilerplate code.

  • .send_file accepts a new optional thumbnail parameter, and returns the Message with the sent file.

Bug fixes

  • The library uses again only a single connection. Less updates are be dropped now, and the performance is even better than using temporary connections.

  • without rowid will only be used on the *.session if supported.

  • Phone code hash is associated with phone, so you can change your mind when calling .sign_in().

Internal changes

  • File cache now relies on the hash of the file uploaded instead its path, and is now persistent in the *.session file. Report any bugs on this!

  • Clearer error when invoking without being connected.

  • Markdown parser doesn’t work on bytes anymore (which makes it cleaner).

Sessions as sqlite databases (v0.16)

Published at 2017/12/28

In the beginning, session files used to be pickle. This proved to be bad as soon as one wanted to add more fields. For this reason, they were migrated to use JSON instead. But this proved to be bad as soon as one wanted to save things like entities (usernames, their ID and hash), so now it properly uses sqlite3, which has been well tested, to save the session files! Calling .get_input_entity using a username no longer will need to fetch it first, so it’s really 0 calls again. Calling .get_entity will always fetch the most up to date version.

Furthermore, nearly everything has been documented, thus preparing the library for Read the Docs (although there are a few things missing I’d like to polish first), and the logging are now better placed.

Breaking changes

  • .get_dialogs() now returns a single list instead a tuple consisting of a custom class that should make everything easier to work with.

  • .get_message_history() also returns a single list instead a tuple, with the Message instances modified to make them more convenient.

Both lists have a .total attribute so you can still know how many dialogs/messages are in total.


  • The mentioned use of sqlite3 for the session file.

  • .get_entity() now supports lists too, and it will make as little API calls as possible if you feed it InputPeer types. Usernames will always be resolved, since they may have changed.

  • .set_proxy() method, to avoid having to create a new TelegramClient.

  • More date types supported to represent a date parameter.

Bug fixes

  • Empty strings weren’t working when they were a flag parameter (e.g., setting no last name).

  • Fix invalid assertion regarding flag parameters as well.

  • Avoid joining the background thread on disconnect, as it would be None due to a race condition.

  • Correctly handle None dates when downloading media.

  • .download_profile_photo was failing for some channels.

  • .download_media wasn’t handling Photo.

Internal changes

  • date was being serialized as local date, but that was wrong.

  • date was being represented as a float instead of an int.

  • .tl parser wasn’t stripping inline comments.

  • Removed some redundant checks on

  • Use a synchronized queue instead a hand crafted version.

  • Use signed integers consistently (e.g. salt).

  • Always read the corresponding TLObject from API responses, except for some special cases still.

  • A few more except low level to correctly wrap errors.

  • More accurate exception types.

  • invokeWithLayer(initConnection(X)) now wraps every first request after .connect().

As always, report if you have issues with some of the changes!

IPv6 support (v0.15.5)

Published at 2017/11/16

Scheme layer used: 73

It’s here, it has come! The library now supports IPv6! Just pass use_ipv6=True when creating a TelegramClient. Note that I could not test this feature because my machine doesn’t have IPv6 setup. If you know IPv6 works in your machine but the library doesn’t, please refer to #425.


  • IPv6 support.

  • New method to extract the text surrounded by MessageEntity‘s, in the extensions.markdown module.


  • Markdown parsing is Done Right.

  • Reconnection on failed invoke. Should avoid “number of retries reached 0” (#270).

  • Some missing autocast to Input* types.

  • The library uses the NullHandler for logging as it should have always done.

  • TcpClient.is_connected() is now more reliable.

Bug fixes

  • Getting an entity using their phone wasn’t actually working.

  • Full entities aren’t saved unless they have an access_hash, to avoid some None errors.

  • .get_message_history was failing when retrieving items that had messages forwarded from a channel.

General enhancements (v0.15.4)

Published at 2017/11/04

Scheme layer used: 72

This update brings a few general enhancements that are enough to deserve a new release, with a new feature: beta markdown-like parsing for .send_message()!


  • .send_message() supports parse_mode='md' for Markdown! It works in a similar fashion to the official clients (defaults to double underscore/asterisk, like **this**). Please report any issues with emojies or enhancements for the parser!

  • New .idle() method so your main thread can do useful job (listen for updates).

  • Add missing .to_dict(), __str__ and .stringify() for TLMessage and MessageContainer.

Bug fixes

  • The list of known peers could end “corrupted” and have users with access_hash=None, resulting in struct error for it not being an integer. You shouldn’t encounter this issue anymore.

  • The warning for “added update handler but no workers set” wasn’t actually working.

  • .get_input_peer was ignoring a case for InputPeerSelf.

  • There used to be an exception when logging exceptions (whoops) on update handlers.

  • “Downloading contacts” would produce strange output if they had semicolons (;) in their name.

  • Fix some cyclic imports and installing dependencies from the git repository.

  • Code generation was using f-strings, which are only supported on Python ≥3.6.

Internal changes

  • The auth_key generation has been moved from .connect() to .invoke(). There were some issues were .connect() failed and the auth_key was None so this will ensure to have a valid auth_key when needed, even if BrokenAuthKeyError is raised.

  • Support for higher limits on .get_history() and .get_dialogs().

  • Much faster integer factorization when generating the required auth_key. Thanks @delivrance for making me notice this, and for the pull request.

Bug fixes with updates (v0.15.3)

Published at 2017/10/20

Hopefully a very ungrateful bug has been removed. When you used to invoke some request through update handlers, it could potentially enter an infinite loop. This has been mitigated and it’s now safe to invoke things again! A lot of updates were being dropped (all those gzipped), and this has been fixed too.

More bug fixes include a correct parsing of certain TLObjects thanks to @stek29, and some wrong calls that would cause the library to crash thanks to @andr-04, and the ReadThread not re-starting if you were already authorized.

Internally, the .to_bytes() function has been replaced with __bytes__ so now you can do bytes(tlobject).

Bug fixes and new small features (v0.15.2)

Published at 2017/10/14

This release primarly focuses on a few bug fixes and enhancements. Although more stuff may have broken along the way.


  • You will be warned if you call .add_update_handler with no update_workers.

  • New customizable threshold value on the session to determine when to automatically sleep on flood waits. See client.session.flood_sleep_threshold.

  • New .get_drafts() method with a custom Draft class by @JosXa.

  • Join all threads when calling .disconnect(), to assert no dangling thread is left alive.

  • Larger chunk when downloading files should result in faster downloads.

  • You can use a callable key for the EntityDatabase, so it can be any filter you need.

Bug fixes

  • .get_input_entity was failing for IDs and other cases, also making more requests than it should.

  • Use basename instead abspath when sending a file. You can now also override the attributes.

  • EntityDatabase.__delitem__ wasn’t working.

  • .send_message() was failing with channels.

  • .get_dialogs(limit=None) should now return all the dialogs correctly.

  • Temporary fix for abusive duplicated updates.

Internal changes

  • MsgsAck is now sent in a container rather than its own request.

  • .get_input_photo is now used in the generated code.

  • .process_entities was being called from more places than only __call__.

  • MtProtoSender now relies more on the generated code to read responses.

Custom Entity Database (v0.15.1)

Published at 2017/10/05

The main feature of this release is that Telethon now has a custom database for all the entities you encounter, instead depending on @lru_cache on the .get_entity() method.

The EntityDatabase will, by default, cache all the users, chats and channels you find in memory for as long as the program is running. The session will, by default, save all key-value pairs of the entity identifiers and their hashes (since Telegram may send an ID that it thinks you already know about, we need to save this information).

You can prevent the EntityDatabase from saving users by setting client.session.entities.enabled = False, and prevent the Session from saving input entities at all by setting client.session.save_entities = False. You can also clear the cache for a certain user through client.session.entities.clear_cache(entity=None), which will clear all if no entity is given.


  • New method to .delete_messages().

  • New ChannelPrivateError class.


  • .sign_in accepts phones as integers.

  • Changing the IP to which you connect to is as simple as client.session.server_address = 'ip', since now the server address is always queried from the session.

Bug fixes

  • .get_dialogs() doesn’t fail on Windows anymore, and returns the right amount of dialogs.

  • GeneralProxyError should be passed to the main thread again, so that you can handle it.

Updates Overhaul Update (v0.15)

Published at 2017/10/01

After hundreds of lines changed on a major refactor, it’s finally here. It’s the Updates Overhaul Update; let’s get right into it!

Breaking changes

  • .create_new_connection() is gone for good. No need to deal with this manually since new connections are now handled on demand by the library itself.


  • You can invoke requests from update handlers. And any other thread. A new temporary will be made, so that you can be sending even several requests at the same time!

  • Several worker threads for your updates! By default, None will spawn. I recommend you to work with update_workers=4 to get started, these will be polling constantly for updates.

  • You can also change the number of workers at any given time.

  • The library can now run in a single thread again, if you don’t need to spawn any at all. Simply set spawn_read_thread=False when creating the TelegramClient!

  • You can specify limit=None on .get_dialogs() to get all of them[1].

  • Updates are expanded, so you don’t need to check if the update has .updates or an inner .update anymore.

  • All InputPeer entities are saved in the session file, but you can disable this by setting save_entities=False.

  • New .get_input_entity method, which makes use of the above feature. You should use this when a request needs a InputPeer, rather than the whole entity (although both work).

  • Assert that either all or None dependent-flag parameters are set before sending the request.

  • Phone numbers can have dashes, spaces, or parenthesis. They’ll be removed before making the request.

  • You can override the phone and its hash on .sign_in(), if you’re creating a new TelegramClient on two different places.

Bug fixes

  • .log_out() was consuming all retries. It should work just fine now.

  • The session would fail to load if the auth_key had been removed manually.

  • Updates.check_error was popping wrong side, although it’s been completely removed.

  • ServerError‘s will be ignored, and the request will immediately be retried.

  • Cross-thread safety when saving the session file.

  • Some things changed on a matter of when to reconnect, so please report any bugs!

Internal changes

  • TelegramClient is now only an abstraction over the TelegramBareClient, which can only do basic things, such as invoking requests, working with files, etc. If you don’t need any of the abstractions the TelegramClient, you can now use the TelegramBareClient in a much more comfortable way.

  • MtProtoSender is not thread-safe, but it doesn’t need to be since a new connection will be spawned when needed.

  • New connections used to be cached and then reused. Now only their sessions are saved, as temporary connections are spawned only when needed.

  • Added more RPC errors to the list.

[1]: Broken due to a condition which should had been the opposite (sigh), fixed 4 commits ahead on

That’s pretty much it, although there’s more work to be done to make the overall experience of working with updates even better. Stay tuned!

Serialization bug fixes (v0.14.2)

Published at 2017/09/29

Bug fixes

  • Important, related to the serialization. Every object or request that had to serialize a True/False type was always being serialized as false!

  • Another bug that didn’t allow you to leave as None flag parameters that needed a list has been fixed.

Internal changes

  • Other internal changes include a somewhat more readable .to_bytes() function and pre-computing the flag instead using bit shifting. The TLObject.constructor_id has been renamed to TLObject.CONSTRUCTOR_ID, and .subclass_of_id is also uppercase now.

Farewell, BinaryWriter (v0.14.1)

Published at 2017/09/28

Version v0.14 had started working on the new .to_bytes() method to dump the BinaryWriter and its usage on the .on_send() when serializing TLObjects, and this release finally removes it. The speed up when serializing things to bytes should now be over twice as fast wherever it’s needed.

Bug fixes

  • This version is again compatible with Python 3.x versions below 3.5 (there was a method call that was Python 3.5 and above).

Internal changes

  • Using proper classes (including the generated code) for generating authorization keys and to write out TLMessage‘s.

Several requests at once and upload compression (v0.14)

Published at 2017/09/27

New major release, since I’ve decided that these two features are big enough:


  • Requests larger than 512 bytes will be compressed through gzip, and if the result is smaller, this will be uploaded instead.

  • You can now send multiple requests at once, they’re simply *var_args on the .invoke(). Note that the server doesn’t guarantee the order in which they’ll be executed!

Internally, another important change. The .on_send function on the TLObjects is gone, and now there’s a new .to_bytes(). From my tests, this has always been over twice as fast serializing objects, although more replacements need to be done, so please report any issues.


  • Implemented .get_input_media helper methods. Now you can even use another message as input media!

Bug fixes

  • Downloading media from CDNs wasn’t working (wrong access to a parameter).

  • Correct type hinting.

  • Added a tiny sleep when trying to perform automatic reconnection.

  • Error reporting is done in the background, and has a shorter timeout.

  • used to fail with wrongly generated code.

Quick fix-up (v0.13.6)

Published at 2017/09/23

Before getting any further, here’s a quick fix-up with things that should have been on v0.13.5 but were missed. Specifically, the timeout when receiving a request will now work properly.

Some other additions are a tiny fix when handling updates, which was ignoring some of them, nicer __str__ and .stringify() methods for the TLObject‘s, and not stopping the ReadThread if you try invoking something there (now it simply returns None).

Attempts at more stability (v0.13.5)

Published at 2017/09/23

Yet another update to fix some bugs and increase the stability of the library, or, at least, that was the attempt!

This release should really improve the experience with the background thread that the library starts to read things from the network as soon as it can, but I can’t spot every use case, so please report any bug (and as always, minimal reproducible use cases will help a lot).

Bug fixes

  • was failing on Python < 3.5 due to some imports.

  • Duplicated updates should now be ignored.

  • .send_message would crash in some cases, due to having a typo using the wrong object.

  • "socket is None" when calling .connect() should not happen anymore.

  • BrokenPipeError was still being raised due to an incorrect order on the try/except block.


  • Type hinting for all the generated Request‘s and TLObjects! IDEs like PyCharm will benefit from this.

  • ProxyConnectionError should properly be passed to the main thread for you to handle.

  • The background thread will only be started after you’re authorized on Telegram (i.e. logged in), and several other attempts at polishing the experience with this thread.

  • The Connection instance is only created once now, and reused later.

  • Calling .connect() should have a better behavior now (like actually trying to connect even if we seemingly were connected already).

  • .reconnect() behavior has been changed to also be more consistent by making the assumption that we’ll only reconnect if the server has disconnected us, and is now private.

Internal changes

  • TLObject.__repr__ doesn’t show the original TL definition anymore, it was a lot of clutter. If you have any complaints open an issue and we can discuss it.

  • Internally, the '+' from the phone number is now stripped, since it shouldn’t be included.

  • Spotted a new place where BrokenAuthKeyError would be raised, and it now is raised there.

More bug fixes and enhancements (v0.13.4)

Published at 2017/09/18


  • TelegramClient now exposes a .is_connected() method.

  • Initial authorization on a new data center will retry up to 5 times by default.

  • Errors that couldn’t be handled on the background thread will be raised on the next call to .invoke() or updates.poll().

Bug fixes

  • Now you should be able to sign in even if you have process_updates=True and no previous session.

  • Some errors and methods are documented a bit clearer.

  • .send_message() could randomly fail, as the returned type was not expected.

  • TimeoutError is now ignored, since the request will be retried up to 5 times by default.

  • “-404” errors (BrokenAuthKeyError‘s) are now detected when first connecting to a new data center.

  • BufferError is handled more gracefully, in the same way as InvalidCheckSumError‘s.

  • Attempt at fixing some “NoneType has no attribute…” errors (with the .sender).

Internal changes

  • Calling GetConfigRequest is now made less often.

  • The initial_query parameter from .connect() is gone, as it’s not needed anymore.

  • Renamed all_tlobjects.layer to all_tlobjects.LAYER (since it’s a constant).

  • The message from BufferError is now more useful.

Bug fixes and enhancements (v0.13.3)

Published at 2017/09/14

Bug fixes

  • Reconnection used to fail because it tried invoking things from the ReadThread.

  • Inferring random ids for ForwardMessagesRequest wasn’t working.

  • Downloading media from CDNs failed due to having forgotten to remove a single line.

  • TcpClient.close() now has a ``threading.Lock``, so NoneType has no close() should not happen.

  • New workaround for msg seqno too low/high. Also, both are not saved anymore.


  • Request will be retried up to 5 times by default rather than failing on the first attempt.

  • InvalidChecksumError‘s are now ignored by the library.

  • TelegramClient.get_entity() is now public, and uses the @lru_cache() decorator.

  • New method to ``.send_voice_note()``‘s.

  • Methods to send message and media now support a ``reply_to`` parameter.

  • .send_message() now returns the full message which was just sent.

New way to work with updates (v0.13.2)

Published at 2017/09/08

This update brings a new way to work with updates, and it’s begging for your feedback, or better names or ways to do what you can do now.

Please refer to the wiki/Usage Modes for an in-depth description on how to work with updates now. Notice that you cannot invoke requests from within handlers anymore, only the v.0.13.1 patch allowed you to do so.

Bug fixes

  • Periodic pings are back.

  • The username regex mentioned on UsernameInvalidError was invalid, but it has now been fixed.

  • Sending a message to a phone number was failing because the type used for a request had changed on layer 71.

  • CDN downloads weren’t working properly, and now a few patches have been applied to ensure more reliability, although I couldn’t personally test this, so again, report any feedback.

Invoke other requests from within update callbacks (v0.13.1)

Published at 2017/09/04


This update brings some big changes to the update system, so please read it if you work with them!

A silly “bug” which hadn’t been spotted has now been fixed. Now you can invoke other requests from within your update callbacks. However this is not advised. You should post these updates to some other thread, and let that thread do the job instead. Invoking a request from within a callback will mean that, while this request is being invoked, no other things will be read.

Internally, the generated code now resides under a lot less files, simply for the sake of avoiding so many unnecessary files. The generated code is not meant to be read by anyone, simply to do its job.

Unused attributes have been removed from the TLObject class too, and .sign_up() returns the user that just logged in in a similar way to .sign_in() now.

Connection modes (v0.13)

Published at 2017/09/04

Scheme layer used: 71

The purpose of this release is to denote a big change, now you can connect to Telegram through different **connection modes**. Also, a second thread will always be started when you connect a TelegramClient, despite whether you’ll be handling updates or ignoring them, whose sole purpose is to constantly read from the network.

The reason for this change is as simple as “reading and writing shouldn’t be related”. Even when you’re simply ignoring updates, this way, once you send a request you will only need to read the result for the request. Whatever Telegram sent before has already been read and outside the buffer.


  • The mentioned different connection modes, and a new thread.

  • You can modify the Session attributes through the TelegramClient constructor (using **kwargs).

  • RPCError‘s now belong to some request you’ve made, which makes more sense.

  • get_input_* now handles None (default) parameters more gracefully (it used to crash).


  • The low-level socket doesn’t use a handcrafted timeout anymore, which should benefit by avoiding the arbitrary sleep(0.1) that there used to be.

  • TelegramClient.sign_in will call .send_code_request if no code was provided.


  • .sign_up does not take a phone argument anymore. Change this or you will be using phone as code, and it will fail! The definition looks like def sign_up(self, code, first_name, last_name='').

  • The old JsonSession finally replaces the original Session (which used pickle). If you were overriding any of these, you should only worry about overriding Session now.

Added verification for CDN file (v0.12.2)

Published at 2017/08/28

Since the Content Distributed Network (CDN) is not handled by Telegram itself, the owners may tamper these files. Telegram sends their sha256 sum for clients to implement this additional verification step, which now the library has. If any CDN has altered the file you’re trying to download, CdnFileTamperedError will be raised to let you know.

Besides this. TLObject.stringify() was showing bytes as lists (now fixed) and RPC errors are reported by default:

In an attempt to help everyone who works with the Telegram API, Telethon will by default report all Remote Procedure Call errors to PWRTelegram, a public database anyone can query, made by Daniil. All the information sent is a GET request with the error code, error message and method used.


If you still would like to opt out, simply set client.session.report_errors = False to disable this feature. However Daniil would really thank you if you helped him (and everyone) by keeping it on!

CDN support (v0.12.1)

Published at 2017/08/24

The biggest news for this update are that downloading media from CDN’s (you’ll often encounter this when working with popular channels) now works.

Bug fixes

  • The method used to download documents crashed because two lines were swapped.

  • Determining the right path when downloading any file was very weird, now it’s been enhanced.

  • The .sign_in() method didn’t support integer values for the code! Now it does again.

Some important internal changes are that the old way to deal with RSA public keys now uses a different module instead the old strange hand-crafted version.

Hope the new, super simple README.rst encourages people to use Telethon and make it better with either suggestions, or pull request. Pull requests are super appreciated, but showing some support by leaving a star also feels nice ⭐️.

Newbie friendly update (v0.12)

Published at 2017/08/22

Scheme layer used: 70

This update is overall an attempt to make Telethon a bit more user friendly, along with some other stability enhancements, although it brings quite a few changes.

Breaking changes

  • The TelegramClient methods .send_photo_file(), .send_document_file() and .send_media_file() are now a single method called .send_file(). It’s also important to note that the order of the parameters has been swapped: first to who you want to send it, then the file itself.

  • The same applies to .download_msg_media(), which has been renamed to .download_media(). The method now supports a Message itself too, rather than only The specialized .download_photo(), .download_document() and .download_contact() still exist, but are private.


  • Updated to layer 70!

  • Both downloading and uploading now support stream-like objects.

  • A lot faster initial connection if sympy is installed (can be installed through pip).

  • libssl will also be used if available on your system (likely on Linux based systems). This speed boost should also apply to uploading and downloading files.

  • You can use a phone number or an username for methods like .send_message(), .send_file(), and all the other quick-access methods provided by the TelegramClient.

Bug fixes

  • Crashing when migrating to a new layer and receiving old updates should not happen now.

  • InputPeerChannel is now casted to InputChannel automtically too.

  • .get_new_msg_id() should now be thread-safe. No promises.

  • Logging out on macOS caused a crash, which should be gone now.

  • More checks to ensure that the connection is flagged correctly as either connected or not.


Downloading files from CDN’s will not work yet (something new that comes with layer 70).

That’s it, any new idea or suggestion about how to make the project even more friendly is highly appreciated.


Did you know that you can pretty print any result Telegram returns (called TLObject‘s) by using their .stringify() function? Great for debugging!

get_input_* now works with vectors (v0.11.5)

Published at 2017/07/11

Quick fix-up of a bug which hadn’t been encountered until now. Auto-cast by using get_input_* now works.

get_input_* everywhere (v0.11.4)

Published at 2017/07/10

For some reason, Telegram doesn’t have enough with the InputPeer. There also exist InputChannel and InputUser! You don’t have to worry about those anymore, it’s handled internally now.

Besides this, every Telegram object now features a new default .__str__ look, and also a .stringify() method to pretty format them, if you ever need to inspect them.

The library now uses the DEBUG level everywhere, so no more warnings or information messages if you had logging enabled.

The no_webpage parameter from .send_message has been renamed to link_preview for clarity, so now it does the opposite (but has a clearer intention).

Quick .send_message() fix (v0.11.3)

Published at 2017/07/05

A very quick follow-up release to fix a tiny bug with .send_message(), no new features.

Callable TelegramClient (v0.11.2)

Published at 2017/07/04

Scheme layer used: 68

There is a new preferred way to invoke requests, which you’re encouraged to use:

# New!
result = client(SomeRequest())

# Old.
result = client.invoke(SomeRequest())

Existing code will continue working, since the old .invoke() has not been deprecated.

When you .create_new_connection(), it will also handle FileMigrateError‘s for you, so you don’t need to worry about those anymore.

Bugs fixes

  • Fixed some errors when installing Telethon via pip (for those using either source distributions or a Python version ≤ 3.5).

  • ConnectionResetError didn’t flag sockets as closed, but now it does.

On a more technical side, msg_id‘s are now more accurate.

Improvements to the updates (v0.11.1)

Published at 2017/06/24

Receiving new updates shouldn’t miss any anymore, also, periodic pings are back again so it should work on the long run.

On a different order of things, .connect() also features a timeout. Notice that the timeout= is not passed as a parameter anymore, and is instead specified when creating the TelegramClient.

Bug fixes

  • Fixed some name class when a request had a .msg_id parameter.

  • The correct amount of random bytes is now used in DH request

  • Fixed CONNECTION_APP_VERSION_EMPTY when using temporary sessions.

  • Avoid connecting if already connected.

Support for parallel connections (v0.11)

Published at 2017/06/16

This update brings a lot of changes, so it would be nice if you could read the whole change log!

Breaking changes

  • Every Telegram error has now its own class, so it’s easier to fine-tune your except‘s.

  • Markdown parsing is not part of Telethon itself anymore, although there are plans to support it again through a some external module.

  • The .list_sessions() has been moved to the Session class instead.

  • The InteractiveTelegramClient is not shipped with pip anymore.


  • A new, more lightweight class has been added. The TelegramBareClient is now the base of the normal TelegramClient, and has the most basic features.

  • New method to .create_new_connection(), which can be ran in parallel with the original connection. This will return the previously mentioned TelegramBareClient already connected.

  • Any file object can now be used to download a file (for instance, a BytesIO() instead a file name).

  • Vales like random_id are now automatically inferred, so you can save yourself from the hassle of writing generate_random_long() everywhere. Same applies to .get_input_peer(), unless you really need the extra performance provided by skipping one if if called manually.

  • Every type now features a new .to_dict() method.

Bug fixes

  • Received errors are acknowledged to the server, so they don’t happen over and over.

  • Downloading media on different data centers is now up to x2 faster, since there used to be an InvalidDCError for each file part tried to be downloaded.

  • Lost messages are now properly skipped.

  • New way to handle the result of requests. The old ValueErrorThe previously sent request must be resent. However, no request was previously sent (possibly called from a different thread).should not happen anymore.

Internal changes

  • Some fixes to the JsonSession.

  • Fixed possibly crashes if trying to .invoke() a Request while .reconnect() was being called on the UpdatesThread.

  • Some improvements on the TcpClient, such as not switching between blocking and non-blocking sockets.

  • The code now uses ASCII characters only.

  • Some enhancements to .find_user_or_chat() and .get_input_peer().

JSON session file (v0.10.1)

Published at 2017/06/07

This version is primarily for people to migrate their .session files, which are pickled, to the new JSON format. Although slightly slower, and a bit more vulnerable since it’s plain text, it’s a lot more resistant to upgrades.


You must upgrade to this version before any higher one if you’ve used Telethon ≤ v0.10. If you happen to upgrade to an higher version, that’s okay, but you will have to manually delete the *.session file, and logout from that session from an official client.


  • New .get_me() function to get the current user.

  • .is_user_authorized() is now more reliable.

  • New nice button to copy the from import Yyy on the online documentation.

  • More error codes added to the errors file.


  • Everything on the documentation is now, theoretically, sorted alphabetically.

  • No second thread is spawned unless one or more update handlers are added.

Full support for different DCs and ++stable (v0.10)

Published at 2017/06/03

Working with different data centers finally works! On a different order of things, reconnection is now performed automatically every time Telegram decides to kick us off their servers, so now Telethon can really run forever and ever! In theory.


  • Documentation improvements, such as showing the return type.

  • The msg_id too low/high error should happen less often, if any.

  • Sleeping on the main thread is not done anymore. You will have to except FloodWaitError‘s.

  • You can now specify your own application version, device model, system version and language code.

  • Code is now more pythonic (such as making some members private), and other internal improvements (which affect the updates thread), such as using logger instead a bare print() too.

This brings Telethon a whole step closer to v1.0, though more things should preferably be changed.

Stability improvements (v0.9.1)

Published at 2017/05/23

Telethon used to crash a lot when logging in for the very first time. The reason for this was that the reconnection (or dead connections) were not handled properly. Now they are, so you should be able to login directly, without needing to delete the *.session file anymore. Notice that downloading from a different DC is still a WIP.


  • Updates thread is only started after a successful login.

  • Files meant to be ran by the user now use shebangs and proper permissions.

  • In-code documentation now shows the returning type.

  • Relative import is now used everywhere, so you can rename telethon to anything else.

  • Dead connections are now detected instead entering an infinite loop.

  • Sockets can now be closed (and re-opened) properly.

  • Telegram decided to update the layer 66 without increasing the number. This has been fixed and now we’re up-to-date again.

General improvements (v0.9)

Published at 2017/05/19

Scheme layer used: 66


  • The documentation, available online here, has a new search bar.

  • Better cross-thread safety by using threading.Event.

  • More improvements for running Telethon during a long period of time.

Bug fixes

  • Avoid a certain crash on login (occurred if an unexpected object ID was received).

  • Avoid crashing with certain invalid UTF-8 strings.

  • Avoid crashing on certain terminals by using known ASCII characters where possible.

  • The UpdatesThread is now a daemon, and should cause less issues.

  • Temporary sessions didn’t actually work (with session=None).

Internal changes

  • .get_dialogs(count= was renamed to .get_dialogs(limit=.

Bot login and proxy support (v0.8)

Published at 2017/04/14


  • Bot login, thanks to @JuanPotato for hinting me about how to do it.

  • Proxy support, thanks to @exzhawk for implementing it.

  • Logging support, used by passing --telethon-log=DEBUG (or INFO) as a command line argument.

Bug fixes

  • Connection fixes, such as avoiding connection until .connect() is explicitly invoked.

  • Uploading big files now works correctly.

  • Fix uploading big files.

  • Some fixes on the updates thread, such as correctly sleeping when required.

Long-run bug fix (v0.7.1)

Published at 2017/02/19

If you’re one of those who runs Telethon for a long time (more than 30 minutes), this update by @strayge will be great for you. It sends periodic pings to the Telegram servers so you don’t get disconnected and you can still send and receive updates!

Two factor authentication (v0.7)

Published at 2017/01/31

Scheme layer used: 62

If you’re one of those who love security the most, these are good news. You can now use two factor authentication with Telethon too! As internal changes, the coding style has been improved, and you can easily use custom session objects, and various little bugs have been fixed.

Updated pip version (v0.6)

Published at 2016/11/13

Scheme layer used: 57

This release has no new major features. However, it contains some small changes that make using Telethon a little bit easier. Now those who have installed Telethon via pip can also take advantage of changes, such as less bugs, creating empty instances of TLObjects, specifying a timeout and more!

Ready, pip, go! (v0.5)

Published at 2016/09/18

Telethon is now available as a `Python package <>`__! Those are really exciting news (except, sadly, the project structure had to change a lot to be able to do that; but hopefully it won’t need to change much more, any more!)

Not only that, but more improvements have also been made: you’re now able to both sign up and logout, watch a pretty “Uploading/Downloading… x%” progress, and other minor changes which make using Telethon easier.

Made InteractiveTelegramClient cool (v0.4)

Published at 2016/09/12

Yes, really cool! I promise. Even though this is meant to be a library, that doesn’t mean it can’t have a good interactive client for you to try the library out. This is why now you can do many, many things with the InteractiveTelegramClient:

  • List dialogs (chats) and pick any you wish.

  • Send any message you like, text, photos or even documents.

  • List the latest messages in the chat.

  • Download any message’s media (photos, documents or even contacts!).

  • Receive message updates as you talk (i.e., someone sent you a message).

It actually is a usable-enough client for your day by day. You could even add libnotify and pop, you’re done! A great cli-client with desktop notifications.

Also, being able to download and upload media implies that you can do the same with the library itself. Did I need to mention that? Oh, and now, with even less bugs! I hope.

Media revolution and improvements to update handling! (v0.3)

Published at 2016/09/11

Telegram is more than an application to send and receive messages. You can also send and receive media. Now, this implementation also gives you the power to upload and download media from any message that contains it! Nothing can now stop you from filling up all your disk space with all the photos! If you want to, of course.

Handle updates in their own thread! (v0.2)

Published at 2016/09/10

This version handles updates in a different thread (if you wish to do so). This means that both the low level TcpClient and the not-so-low-level MtProtoSender are now multi-thread safe, so you can use them with more than a single thread without worrying!

This also implies that you won’t need to send a request to receive an update (is someone typing? did they send me a message? has someone gone offline?). They will all be received instantly.

Some other cool examples of things that you can do: when someone tells you “Hello”, you can automatically reply with another “Hello” without even needing to type it by yourself :)

However, be careful with spamming!! Do not use the program for that!

First working alpha version! (v0.1)

Published at 2016/09/06

Scheme layer used: 55

There probably are some bugs left, which haven’t yet been found. However, the majority of code works and the application is already usable! Not only that, but also uses the latest scheme as of now and handles way better the errors. This tag is being used to mark this release as stable enough.