Python 裝飾器 @

gistfile1.txt

import time

def timeusage(func):
    def call(*args, **kwargs): 
        start = time.clock()
        print func(*args, **kwargs)
        end = time.clock()
        return "Time costs : %s . " % (end - start )
    return call


@timeusage
def factorial(n):
    y=1
    for i in range(n, 0, -1):
        y = y * i
    return y


print factorial(10)