python 培训之 装饰器

#! /usr/env/python
# -*- coding:UTF-8 -*-
from __future__ import print_function


def f1(x):
    return x*2

def new_fn(f):
    def fn(x):
        print("call"+f.__name__+‘()‘)
        return f(x)
    return fn


a = new_fn(f1)(2)
print(a)
print("##################")
b = f1(2)
print(b)

@new_fn
def f1(x):
    return x*2

f1 = new_fn(f1)
f1(5)