def get_user_profile_photos(self, user_id, offset=None, limit=None):
        """
        Retrieves the user profile photos of the person with 'user_id'
        See https://core.telegram.org/bots/api#getuserprofilephotos
        :param user_id:
        :param offset:
        :param limit:
        :return: API reply.
        """
        result = apihelper.get_user_profile_photos(self.token, user_id, offset, limit)
        return types.UserProfilePhotos.de_json(result)
Retrieves the user profile photos of the person with 'user_id'
        See https://core.telegram.org/bots/api#getuserprofilephotos
        :param user_id:
        :param offset:
        :param limit:
        :return: API reply.