类的装饰器

def deco(func):
    print(‘======‘)
    return func

@deco           #--->test=deco(test)
def test():
    print(‘test----‘)

test()

#result
# ======
# test----


@deco               #------>Foo=deco(Foo)
class Foo:
    pass
#======

def deco(obj):
    obj.x=1
    obj.y=2
    obj.z=3
    return obj

@deco               #------>Foo=deco(Foo)
class Foo:
    pass


print(Foo.__dict__)
# {‘__module__‘: ‘__main__‘, ‘__dict__‘: <attribute ‘__dict__‘ of ‘Foo‘ objects>, ‘__weakref__‘: <attribute ‘__weakref__‘ of ‘Foo‘ objects>, ‘__doc__‘: None, ‘x‘: 1, ‘y‘: 2, ‘z‘: 3}