View difference between Paste ID: 0118Cs5v and hzb38SuF

 class Field(object):
     def __init__(self, name, column_type):
         self.name = name
         self.column_type = column_type
 
     def __str__(self):
         return '<%s:%s>' % (self.__class__.__name__, self.name)
 
 
 class StringField(Field):
     def __init__(self, name):
         super(StringField, self).__init__(name, 'varchar(100)')
 
 
 class IntegerField(Field):
     def __init__(self, name):
         super(IntegerField, self).__init__(name, 'bigint')
 
 
 class Model(dict):
     __db__ = 'db_name'
 
     def __new__(cls, **kws):
 
         cls.__table__ = cls.__name__
         cls.__mappings__ = {k: getattr(cls, k) for k in dir(
             cls) if isinstance(getattr(cls, k), Field)}
 
         return super().__new__(cls, **kws)
 
     def __init__(self, **kws):
         for k in self.__mappings__.keys():
             setattr(self, k, kws.get(k))
 
         _kws = {k: v for k, v in kws.items() if k in self.__mappings__.keys()}
         super().__init__(**_kws)
 
     def __setattr__(self, key, value):
 
         print('set: ', key, '--->', value)
         if key not in self.__mappings__.keys():
             raise AttributeError(r'unavailable key: %s' % key)
         self[key] = value
         super().__setattr__(key, value)
 
     def save(self):
         fields = []
         params = []
         args = []
         for k, v in self.__mappings__.items():
             fields.append(v.name)
             params.append('?')
             args.append(getattr(self, k, None))
 
         sql = 'insert into %s (%s) values (%s)' % (
             self.__table__, ','.join(fields), ','.join(params))
         print('SQL: %s' % sql)
         print('ARGS: %s' % str(args))
 
 
 class User(Model):
 
     id = IntegerField('id')
     name = StringField('username')
     email = StringField('email')
     password = StringField('password')
 
 
 class SubUser(User):
 
     nickname = StringField('nickname')
 
 
 if __name__ == '__main__':
 
     u = User(id=123, name='Michael', email='[email protected]', password='my-pwd')
     u.save()