python 闭包

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def two_type(t=1):
    def dec(fun):
        def real_fun(x):
            if t == 1:
                print ("i am real")
            else:
                print ("i am false")
            fun(x)
        return real_fun
    return dec

@two_type(t=0)
def fun(x):
    print(2*x)
fun(2)