标签:pytho span web size username and *args enc ***
# 1.编写装饰器,为多个函数加上认证的功能(用户的账号密码来源于文件), # 要求登录成功一次,后续的函数都无需再输入用户名和密码 # FLAG = False # def login(func): # def inner(*args,**kwargs): # global FLAG # ‘‘‘登录程序‘‘‘ # if FLAG: # ret = func(*args, **kwargs) # func是被装饰的函数 # return ret # else: # username = input(‘username : ‘) # password = input(‘password : ‘) # if username == ‘boss_gold‘ and password == ‘22222‘: # FLAG = True # ret = func(*args,**kwargs) #func是被装饰的函数 # return ret # else: # print(‘登录失败‘) # return inner # # @login # def shoplist_add(): # print(‘增加一件物品‘) # # @login # def shoplist_del(): # print(‘删除一件物品‘) # # shoplist_add() # shoplist_del() # 2.编写装饰器,为多个函数加上记录调用功能,要求每次调用函数都将被调用的函数名称写入文件 # def log(func): # def inner(*args,**kwargs): # with open(‘log‘,‘a‘,encoding=‘utf-8‘) as f: # f.write(func.__name__+‘\n‘) # ret = func(*args,**kwargs) # return ret # return inner # # @log # def shoplist_add(): # print(‘增加一件物品‘) # # @log # def shoplist_del(): # print(‘删除一件物品‘) # shoplist_add() # shoplist_del() # shoplist_del() # shoplist_del() # shoplist_del() # shoplist_del() # 进阶作业(选做): # 1.编写下载网页内容的函数,要求功能是:用户传入一个url,函数返回下载页面的结果 # 2.为题目1编写装饰器,实现缓存网页内容的功能: # 具体:实现下载的页面存放于文件中,如果文件内有值(文件大小不为0),就优先从文件中读取网页内容,否则,就去下载,然后存到文件中 import os from urllib.request import urlopen def cache(func): def inner(*args,**kwargs): if os.path.getsize(‘web_cache‘): with open(‘web_cache‘,‘rb‘) as f: return f.read() ret = func(*args,**kwargs) #get() with open(‘web_cache‘,‘wb‘) as f: f.write(b‘*********‘+ret) return ret return inner @cache def get(url): code = urlopen(url).read() return code # {‘网址‘:"文件名"} ret = get(‘http://www.baidu.com‘) print(ret) ret = get(‘http://www.baidu.com‘) print(ret) ret = get(‘http://www.baidu.com‘) print(ret)
标签:pytho span web size username and *args enc ***
原文地址:https://www.cnblogs.com/xiao-zhi/p/9896219.html