Python 装饰器语法糖给函数实现附加功能

import time
#exetime该函数用来测试 某个函数运行时间
def exetime(func):
    def newfunc(*args, **args2):
        # 可以接受任意参数个数的函数
        start_time = time.time()
        back = func(*args, **args2)
        now_time = time.time()
        print("{:20s}".format(func.__name__) + " : " + "{:5.1f}".format((now_time - start_time) * 1000) + "ms")
        return back

    return newfunc


#下面相当于：exetime(funcA)
@exetime
def funcA(arg1, arg2):
    pass


#下面相当于：exetime(funcB)
@exetime
def funcB(arg1, arg2, arg3):
    pass

if __name__ == '__main__':
    f(a,b)
    f(a,b,c)