util.py

def uid_from_update(update):
    """
    Extract the user id from update
    :param update: `telegram.Update`
    :return: user_id extracted from the update
    """
    user_id = None
    try:
        user_id = update.message.from_user.id
    except (NameError, AttributeError):
        try:
            user_id = update.inline_query.from_user.id
        except (NameError, AttributeError):
            try:
                user_id = update.chosen_inline_result.from_user.id
            except (NameError, AttributeError):
                try:
                    user_id = update.callback_query.from_user.id
                except (NameError, AttributeError):
                    logging.error("No chat_id available in update.")
    return user_idchat_id