python中metaclass的工作原理

class TMetaclass(type): def __new__(cls, name, bases, attrs): print(cls, name, bases, attrs) return type.__new__(cls, name, bases, attrs) # class T(dict, metaclass=TMetaclass): # def __init__(self, **kw): # super(T, self).__init__(**kw) class T(dict, metaclass=TMetaclass): pass class Test(T): pass class Test1(Test): pass a = Test1()

输出：

<class '__main__.TMetaclass'> T (<class 'dict'>,) {'__module__': '__main__', '__qualname__': 'T'} <class '__main__.TMetaclass'> Test (<class '__main__.T'>,) {'__module__': '__main__', '__qualname__': 'Test'} <class '__main__.TMetaclass'> Test1 (<class '__main__.Test'>,) {'__module__': '__main__', '__qualname__': 'Test1'} [Finished in 0.1s]

转载于:https://www.cnblogs.com/busui/p/7287339.html

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