class UserProfilePhotos(JsonDeserializable):
    @classmethod
    def de_json(cls, json_string):
        if (json_string is None):
            return None
        obj = cls.check_json(json_string)
        total_count = obj['total_count']
        photos = [[PhotoSize.de_json(y) for y in x] for x in obj['photos']]
        return cls(total_count, photos)

    def __init__(self, total_count, photos):
        self.total_count = total_count
        self.photos = photos

class PhotoSize(JsonDeserializable):
    @classmethod
    def de_json(cls, json_string):
        if (json_string is None): return None
        obj = cls.check_json(json_string)
        file_id = obj['file_id']
        width = obj['width']
        height = obj['height']
        file_size = obj.get('file_size')
        return cls(file_id, width, height, file_size)

    def __init__(self, file_id, width, height, file_size=None):
        self.file_size = file_size
        self.height = height
        self.width = width
        self.file_id = file_id

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)