"""访问网址，并且将网址的内容返回给文件，如果有文件且不为0。则读取即可。若没有则新建文件""" from urllib.request import urlopen def wrapper(func):     def inner(*args,**kwargs):         """装饰函数之前执行的操作"""         import os         if os.path.getsize('web'):             with open('web','rb') as f:                 return f.read()         ret = func(*args, **kwargs)         with open('web','wb') as f:             f.write(b'*******'+ret)         return ret         """装饰函数之后的执行的操作"""     return inner @wrapper def get(url):     content=urlopen(url).read()     return content res=get('http://www.baidu.com') print(res)