telegram.ext.PrefixHandler

class telegram.ext.PrefixHandler(prefix, command, callback, filters=None, pass_args=False, pass_update_queue=False, pass_job_queue=False, pass_user_data=False, pass_chat_data=False, run_async=False)

Bases: telegram.ext.handler.Handler[telegram.update.Update, telegram.ext.utils.types.CCT]

Handler class to handle custom prefix commands.

This is a intermediate handler between MessageHandler and CommandHandler. It supports configurable commands with the same options as CommandHandler. It will respond to every combination of prefix and command. It 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.

Examples

Single prefix and command:

PrefixHandler('!', 'test', callback)  # will respond to '!test'.

Multiple prefixes, single command:

PrefixHandler(['!', '#'], 'test', callback)  # will respond to '!test' and '#test'.

Multiple prefixes and commands:

PrefixHandler(['!', '#'], ['test', 'help'], callback)  # will respond to '!test',             '#test', '!help' and '#help'.

By default the handler listens to messages as well as edited messages. To change this behavior use ~Filters.update.edited_message.

Note

Warning

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

Parameters
  • prefix (telegram.utils.types.SLT[str]) – The prefix(es) that will precede command.

  • command (telegram.utils.types.SLT[str]) – The command or list of commands this handler should listen for.

  • callback (callable) –

    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 for context based API:

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

  • pass_args (bool, optional) – Determines whether the handler should be passed the arguments passed to the command as a keyword argument called args. It will contain a list of strings, which is the text following the command split on single or consecutive whitespace characters. Default is False DEPRECATED: Please switch to context based callbacks.

  • pass_update_queue (bool, optional) – If set to True, a keyword argument called update_queue will be passed to the callback function. It will be the Queue instance used by the telegram.ext.Updater and telegram.ext.Dispatcher that contains new updates which can be used to insert updates. Default is False. DEPRECATED: Please switch to context based callbacks.

  • pass_job_queue (bool, optional) – If set to True, a keyword argument called job_queue will be passed to the callback function. It will be a telegram.ext.JobQueue instance created by the telegram.ext.Updater which can be used to schedule new jobs. Default is False. DEPRECATED: Please switch to context based callbacks.

  • pass_user_data (bool, optional) – If set to True, a keyword argument called user_data will be passed to the callback function. Default is False. DEPRECATED: Please switch to context based callbacks.

  • pass_chat_data (bool, optional) – If set to True, a keyword argument called chat_data will be passed to the callback function. Default is False. DEPRECATED: Please switch to context based callbacks.

  • run_async (bool) – Determines whether the callback will run asynchronously. Defaults to False.

callback

The callback function for this handler.

Type

callable

filters

Optional. Only allow updates with these Filters.

Type

telegram.ext.BaseFilter

pass_args

Determines whether the handler should be passed args.

Type

bool

pass_update_queue

Determines whether update_queue will be passed to the callback function.

Type

bool

pass_job_queue

Determines whether job_queue will be passed to the callback function.

Type

bool

pass_user_data

Determines whether user_data will be passed to the callback function.

Type

bool

pass_chat_data

Determines whether chat_data will be passed to the callback function.

Type

bool

run_async

Determines whether the callback will run asynchronously.

Type

bool

check_update(update)

Determines whether an update should be passed to this handlers callback.

Parameters

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

Returns

The list of args for the handler.

Return type

list

property command

The list of commands this handler should listen for.

Returns

List[str]

property prefix

The prefixes that will precede command.

Returns

List[str]