# !/usr/bin/env python3 # -*- coding: utf-8 -*- #请编写一个decorator #能在函数调用的前后打印出'begin call'和'end call'的日志 import functools def log(fn): @functools.wraps(fn) def wrapper(*arg, **kw): print('begin call') fm = fn(*arg, **kw) #此处需要函数运行一遍, print(fm) #打印函数运行结果 print('end call') return fm return wrapper @log def f(x, y): return x + y f(5, 8) + 9
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