A python wrapper and bot builder for the telegram bot api.

Can be found on PyPI https://pypi.python.org/pypi/telegram-bot-api/0.2

The simplest way to build a bot with this package is the botbuilder, here are some short and easy ways to create a bot.

import telegram.botapi.botbuilder as botbuilder

  def echo_text(update):
      if len(update.text) >= 7:
        return update.text[6:]
      else:
        return ""
  
  if __name__ == "__main__":
    botbuilder.BotBuilder(apikey_file="apikey.txt") \
      .send_message_when("echo", echo_text) \
      .build().start()

To explain, the send_message_when method takes as first argument a command (without the preceding /) and as second argument a function which acts upon the update which trigged the event (a /echo command) and returns a response message. Long story short, you send /echo foobar to the bot, and it answers with foobar.

import telegram.botapi.botbuilder as botbuilder

  def logger(update):
    print("received update with text:", update.text)

  def contains_photo(update):
    return "photo" in update.text.lower()
    
  def photo_file_handle(update):
    if "cat" in update.text.lower():
      return open("cat.png", "rb")
    else if "dog" in update.text.lower():
      return open("dog.png", "rb")
    else:
      return open("emu.png", "rb")
      
    if __name__ == "__main__":
      botbuilder.BotBuilder(apikey_file="apikey.txt") \
        .do_when(lambda update: return True, logger, botbuilder.DO_NOT_CONSUME) \
        .send_photo_when("penguin", "penguin.png") \
        .send_photo_when(contains_photo, photo_file_handle) \
        .build().start()

In this example, a logger is registered to receive all events via the do_when method and a simple lambda which matches all update events, to allow the event to get passed to other matchers, the botbuilder.DO_NOT_CONSUME constant is used, you can also use botbuilder.CONSUME to explicitly state that an update event should be consumed by the action.

Next, an action is registered, which receives /penguin commands and sends back the penguin.png file, the last action is registered to be executed when contains_photo matches, that is, if a message contains the the text "photo", the action then looks for other words specifying the photo to be sent and returns a file handle to it.

• do_when(matcher, result_generator, consume=True, optionals={})
• send_message_when(matcher, result_generator (or string), consume=True, optionals={})
• forward_message_when(matcher, result_generator (or tuple, see below), ...)
• send_location_when(matcher, result_generator (or tuple, see below), ...)
• send_photo_when(matcher, result_generator (or filename), ...)
• send_audio_when(matcher, result_generator (or filename), ...)
• send_document_when(matcher, result_generator (or filename), ...)
• send_sticker_when(matcher, result_generator (or filename), ...)
• send_video_when(matcher, result_generator (or filename), ...)

Instead of the result_generator function, you can instead directly use values as parameters, in the case of send_location_when, you could replace the result_generator with a (latitude, longitude) tuple.

Optionals are the optional parameters that can be used by the telegram api, in the case of send_photo_when, {"caption": "A photo of some mountains"} would be a valid optional parameter. The result_generator function can also return optional parameters as the last item in a tuple, for example

def get_photo(update):
    return open("photo.png", "rb"), {"caption": "some photo"}

This can be used if the optional parameters are dependent on the content of the update.

Based on the type of response to send, the result_generator has to return different values, this is where it gets confusing:

• in do_when, it can return anything, the value is not used.
• in send_message_when, it can return string or string, optionals
• in forward_message_when, it can return from_chat_id, message_id[, optionals]
• in send_location_when, it can return latitude, longitude[, optionals] or a list
• in send_[filetype]_when, it can return filehandle_filename_or_id[, is_id][, optionals]

The is_id parameter defaults to False and effects the handling of the return value, if it is a string. If is_id is False, the returned string will be treated as a filename, if it is True, the returned string will be treated as a file_id for the telegram api. If the returned value is not a string, the is_id parameter is not taken into account.

• connector explanation
• bot explanation