计算函数执行时间的装饰器

import time
def wrapper(func):
    def inner(*args,**kwargs):
        """函数执行之前的操作"""
        start_time=time.time()
        time.sleep(4)
        res=func(*args,**kwargs)
        dur=time.time()-start_time
        print("该函数的执行时间：%s" %dur)
        """函数执行后执行的操作"""
        return res
    return inner
@wrapper
def lin(str):
    len = 0
    for i in str:
        len+=1
    print('该字符串长度为;%s' %len)
    return "装饰器函数"
link=lin('123134')
print(link)