python笔记：1.6.3装饰器

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# -*- coding: utf-8 -*-
"""
Created on Fri May 10 22:48:19 2019

@author: User
"""

import time

def timecal(func):
    def wrapper(*args, **kw):
        start = time.time()
        func(*args, **kw)
        stop = time.time()
        print('run time is %s ' %(stop - start))
    return wrapper

@timecal
def snn(n, beg = 1):
    s = 0;
    for i in range(beg, n + 1):
        s += i
    print('Sum of natural numbers within [%s, %s] is %s' %(beg, n, s))
    
print(snn(100))

运行：

Sum of natural numbers within [1, 100] is 5050
run time is 0.0010046958923339844 
None