使用__call__(self,[..)方法将类变成装饰器

class Describer(object):

    def __init__(self, name):
        self.name = name

    def __call__(self, func):  # func 是 Foo().foo
        print ‘im Describer call‘

        def inner(foo_self, *args):  # foo_self是Foo()对象
            print foo_self.name
            return func(foo_self, *args)

        return inner


class Foo(object):

    def __init__(self):
        self.name = ‘www‘

    @Describer(‘zhn‘)  # 相当于 temp = Describer(__init__); inner = temp__call__(foo); func_result = inner(foo_self, *args)
    def foo(self):
        return ‘im Foo instance foo‘


f = Foo()
print f.foo()

im Describer call
www
im Foo instance foo