CommandHandler

class telegram.ext.CommandHandler(command, callback, filters=None, block=True, has_args=None)

Bases: telegram.ext.BaseHandler

Handler class to handle Telegram commands.

Commands are Telegram messages that start with /, optionally followed by an @ and the bot’s name and/or some additional text. The handler will add a list to the CallbackContext named CallbackContext.args. It will contain a list of strings, which is the text following the command split on single or consecutive whitespace characters.

By default, the handler listens to messages as well as edited messages. To change this behavior use ~filters.UpdateType.EDITED_MESSAGE in the filter argument.

Note

CommandHandler does not handle (edited) channel posts and does not handle commands that are part of a caption. Please use MessageHandler with a suitable combination of filters (e.g. telegram.ext.filters.UpdateType.CHANNEL_POSTS, telegram.ext.filters.CAPTION and telegram.ext.filters.Regex) to handle those messages.

Warning

When setting block to False, you cannot rely on adding custom attributes to telegram.ext.CallbackContext. See its docs for more info.

Examples

• Timer Bot

• Error Handler Bot

Available In

telegram.ext.Application.handlers

Changed in version 20.0:

• Renamed the attribute command to commands, which now is always a frozenset

• Updating the commands this handler listens to is no longer possible.

Parameters:

• command (str | Collection[str]) – The command or list of commands this handler should listen for. Case-insensitive. Limitations are the same as for telegram.BotCommand.command.

• callback (coroutine function) –

  The callback function for this handler. Will be called when check_update() has determined that an update should be processed by this handler. Callback signature:

  async def callback(update: Update, context: CallbackContext)
  

  The return value of the callback is usually ignored except for the special case of telegram.ext.ConversationHandler.

• filters (telegram.ext.filters.BaseFilter, optional) – A filter inheriting from telegram.ext.filters.BaseFilter. Standard filters can be found in telegram.ext.filters. Filters can be combined using bitwise operators (& for and, | for or, ~ for not)

• block (bool, optional) –

  Determines whether the return value of the callback should be awaited before processing the next handler in telegram.ext.Application.process_update(). Defaults to True.

  See also

  Concurrency

• has_args (bool | int, optional) –

  Determines whether the command handler should process the update or not. If True, the handler will process any non-zero number of args. If False, the handler will only process if there are no args. if int, the handler will only process if there are exactly that many args. Defaults to None, which means the handler will process any or no args.

  Added in version 20.5.

Raises:

ValueError – When the command is too long or has illegal chars.

commands

The set of commands this handler should listen for.

Type:

FrozenSet[str]

callback

The callback function for this handler.

Type:

coroutine function

filters

Optional. Only allow updates with these filters.

Type:

telegram.ext.filters.BaseFilter

block

Determines whether the return value of the callback should be awaited before processing the next handler in telegram.ext.Application.process_update().

Type:

bool

has_args

Optional argument, otherwise all implementations of CommandHandler will break. Defaults to None, which means the handler will process any args or no args.

Added in version 20.5.

Type:

bool | int | None

check_update(update)

Determines whether an update should be passed to this handler’s callback.

Parameters:

update (telegram.Update | object) – Incoming update.

Returns:

The list of args for the handler.

Return type:

list

collect_additional_context(context, update, application, check_result)

Add text after the command to CallbackContext.args as list, split on single whitespaces and add output of data filters to CallbackContext as well.