See: https://core.telegram.org/bots/api#sendphoto

        :param photo:
            - string: ``file_id`` for a photo existing on Telegram servers
            - string: HTTP URL of a photo from the Internet
            - file-like object: obtained by ``open(path, 'rb')``
            - tuple: (filename, file-like object). If the filename contains
              non-ASCII characters and you are using Python 2.7, make sure the
              filename is a unicode string.

async def sendPhoto(self, chat_id, photo,
                        caption=None,
                        parse_mode=None,
                        disable_notification=None,
                        reply_to_message_id=None,
                        reply_markup=None):
        """
        See: https://core.telegram.org/bots/api#sendphoto

        :param photo:
            - string: ``file_id`` for a photo existing on Telegram servers
            - string: HTTP URL of a photo from the Internet
            - file-like object: obtained by ``open(path, 'rb')``
            - tuple: (filename, file-like object). If the filename contains
              non-ASCII characters and you are using Python 2.7, make sure the
              filename is a unicode string.
        """
        p = _strip(locals(), more=['photo'])
        return await self._api_request_with_file('sendPhoto', _rectify(p), 'photo', photo)