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  • 无参装饰器作业

    # 一:编写函数,(函数执行的时间用time.sleep(n)模拟)
    import time  # 源码
    def func():
        time.sleep(3)  # 单位: 秒
    func()

    # 二:编写装饰器,为函数加上统计时间的功能
    import time 
    def timer(func):  
        def inner(*args, **kwargs): 
            start_time = time.time()
            res = func(*args, **kwargs)  
            end_time = time.time()
            print(f'当前被装饰对象[{func.__name__}] 执行时间为: [{end_time - start_time}]')
            return res
        return inner
    @timer  
    def func_demo():
        time.sleep(3)  

    # 三:编写装饰器,为函数加上认证的功能
    login_user = None
    # 登录功能
    def login():
        username = input('请输入用户名: ').strip()
        password = input('请输入密码: ').strip()
        if username == 'tank' and password == '123':
            print('登录成功')
            global login_user
            login_user = username
        else:
            print('登录失败')
    
    # 登录认证装饰器
    def login_auth(func):
        def inner(*args, **kwargs):
            if login_user:
                res = func(*args, **kwargs)
                return res
            else:
                print('未有用户登录,无法使用好玩的功能!')
                login()
        return inner
    
    @login_auth
    def play():
        print('开始play了啊....')
        pass
    
    @login_auth
    def shopping():
        pass
    # 四: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
    # 注意:从文件中读出字符串形式的字典,可以用eval('{"name":"egon","password":"123"}')转成字典格式
    with open('db.txt', 'r', encoding='utf-8') as f:
        user_data = f.read()
        user_dic = eval(user_data)
    user_dic = user_dic
    login_info = None
    def login():
        username = input('请输入用户名: ').strip()
        if username in user_dic.get('name'):
            password = input('请输入密码: ').strip()
            if password == user_dic.get('pwd'):
                print('login successful')
                global login_info
                login_info = {username: password}
            else:
                print('密码错误')
        else:
            print('用户不存在')
    
    def login_auth(func):
        def inner(*args, **kwargs):
            if login_info:
                res = func(*args, **kwargs)
                return res
            else:
                login()
        return inner
    @login_auth
    def withdraw():
        pass
    @login_auth
    def shopping():
        pass
    # 五:编写装饰器,为多个函数加上认证功能,要求登录成功一次,在超时时间内无需重复登录,超过了超时时间,则必须重新登录
    import time
    sum_time = 0  
    def time_wait(func):
        wait_time = 6
        def inner(*args, **kwargs):
            start_time = time.time()
            res = func(*args, **kwargs)
            end_time = time.time()
            global sum_time
            # 第一个函数进来后,func1 执行时长为3, func2 执行时长为3
            sum_time += (end_time - start_time)
            print(f'登录后执行的总时长: {sum_time}')
            if sum_time >= wait_time:
                login()
                sum_time = 0
            else:
                return res
        return inner
    
    @time_wait
    def func1():
        time.sleep(3)
    
    @time_wait
    def func2():
        time.sleep(3)
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  • 原文地址:https://www.cnblogs.com/bk134/p/12553804.html
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