元类

（1）使用type直接创建类

Test = type('Test01', (object,), {'name': 'haha', 'age': 18})
t1 = Test()
print(type(t1))
print(Test.__dict__)

 

（2）继承type，用继承类创建类

class MyTypeClass(type):
    def __new__(cls, name, base, attr: dict, *args, **kwargs):
        print('---------修改元类-------')
        attr_dict = {}
        for k, v in attr.items():
            attr_dict[k.upper()] = v
        __slots__ = ['name','age']
        return type.__new__(cls, name, base, attr_dict)


class MyClass(metaclass=MyTypeClass):
    name='hahaha'
    age='19'
    name1 = 'hhh'


t2 = MyClass()
print(type(t2))
print(MyClass.__dict__)