python 创建类先执行metaclass父类__new__ > __init__>__call__ 然后再执行自己的__new__>__init__

class MyType(type):

def __init__(self,*args,**kwargs):

print("Mytype __init__",*args,**kwargs)

def __call__(self, *args, **kwargs):

print("Mytype __call__", *args, **kwargs)

obj = self.__new__(self)

print("obj ",obj,*args, **kwargs)

print(self)

self.__init__(obj,*args, **kwargs)

return obj

def __new__(cls, *args, **kwargs):

print("Mytype __new__",*args,**kwargs)

return type.__new__(cls, *args, **kwargs)

print('here...')

class Foo(object,metaclass=MyType):

def __init__(self,name):

self.name = name

print("Foo __init__")

def __new__(cls, *args, **kwargs):

print("Foo __new__",cls, *args, **kwargs)

return object.__new__(cls)

f = Foo("Alex")

print("f",f)

print("fname",f.name)