Python9-day11-作业

# 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,**kewargs):
        global  FLAG
        if FLAG:
            ret = func(*args,**kewargs)
            return ret
        else:
            username = input('username: ')
            password = input('password: ')
            if username == 'tim' and password == 'cisco':
                FLAG = True
                ret = func(*args,**kewargs)
                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',mode='a',encoding='utf-8') as f:
            f.write(func.__name__+'\n')
        ret = func(*args,**kwargs)
        return ret
    return inner

@log        #shoplist_add=log(shoplist_add)
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_add()
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

from urllib.request import  urlopen
import os
from urllib.request import  urlopen
def cache(func):
    def inner(*args,**kwargs):
        if os.path.getsize('web_cache'):   #不等于0就会读文件,等于0就会执行写
            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
ret = get('http://www.baidu.com/')
print(ret)
ret = get('http://www.baidu.com/')
print(ret)
ret = get('http://www.baidu.com/')
print(ret)

 


Python9-day11-作业

 






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