python练习题-day11

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 wrapper(fun):
    def inner(*args,**kwargs):
        global flag
        if flag==True:
            res=fun(*args,**kwargs)
            return res
        if flag==False:
            count=0
            while count<3:
                uname=input("请输入用户名：")
                pwd=input("请输入密码：")
                f1=open("info_database",encoding="utf-8") #打开存储类型为字典的一个文件
                data=f1.read()
                if eval(data).get(uname)==pwd:
                    res=fun(*args,**kwargs)
                    flag=True
                    return res

                else:
                    print("用户名或密码错误，请重新输入(你还有%s次机会)"%(2-count))
                    count+=1
    return inner
@wrapper
def goods_add():
    print("购买商品")
@wrapper
def good_del():
    print("删除商品")

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 wrapper(fun):
    def inner(*args,**kwargs):
        with open("log.txt","a",encoding="utf-8") as f1:
            f1.write(fun.__name__+"\n")

        res=fun(*args,**kwargs)
        return res
    return inner
@wrapper
def good_add():
    print("购买商品")

good_add()
good_add()

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