为什么我的不行啊

Question

import timefrom functools import  reducedef log(f):    def fn(x):        print ('call' + f._name_ +'()...')        return f(x)    return fn@logdef fac(n):    return reduce(lambda x,y:x*y,range(1,n+1))print fac(2)    Traceback (most recent call last):  File "C:\Users\gege\Desktop\aa.py", line 11, in <module>    print fac(2)  File "C:\Users\gege\Desktop\aa.py", line 5, in fn    print ('call' + f._name_ +'()...')AttributeError: 'function' object has no attribute '_name_'>>> 

Answer 1

__name__，不是_name_