import json

class TelegramObject():

    def __init__(self, update_json):
        self.parse_json(**update_json)
        print(self)


    def parse_json(self, **kwargs):
        my_globals = globals()
        for k,v in kwargs.items():
            classes = {'from': 'User', 'chat': 'Chat', 'message': 'Message'}
            if k in classes:
                var_name = k
                class_name = classes[k]
                my_globals[var_name] = my_globals[class_name](v)
            else:
                setattr(self, k , v)


    def __str__(self):
        return f'{type(self)}: {self.__dict__}'

    def to_json():
        pass


class User(TelegramObject):
    pass

class Chat(TelegramObject):
    pass

class Message(TelegramObject):
    pass


class IncUpdate(TelegramObject):
    pass

s = '{"message": {"chat": {"type": "private", "first_name": "SOKOLOV", "id": 1144234}, "from": {"first_name": "SOKOLOV", "language_code": "ru", "is_bot": false, "id": 1144234}, "message_id": 828, "text": "\\u043f\\u0440\\u0438\\u0432\\u0435", "date": 1575803706}, "update_id": 716583963}'
update_json = json.loads(s)
upd_object = IncUpdate(update_json)

print(upd_object)