作业3.21

一：编写函数，（函数执行的时间用time.sleep(n)模拟）

def timer():
    start_time = time.time()
    time.sleep(3)
    stop_time = time.time()
    use_time = stop_time - start_time
    print(use_time)

二：编写装饰器，为函数加上统计时间的功能

def outer(func):
    def timer(*args, **kwargs):
        start_time = time.time()
        res = func(*args, **kwargs)
        stop_time = time.time()
        use_time = stop_time - start_time
        print(use_time)
        return res

    return timer
def func():
   print(10) 

func()
三：编写装饰器，为函数加上认证的功能

def auth(func):
    def inter(*args, **kwargs):
        while True:
            name = input("请输入用户名:").strip()
            with open("use.txt",'r',encoding='utf-8') as f:
                for line in f:
                    user_name,user_pwd = line.strip().split("-")
                    if name == user_name:
                        while True:
                            pwd = input("请输入密码:").strip()
                            if pwd == user_pwd:
                                print("欢迎登陆。")
                                res = func(*args,**kwargs)
                                return res
                else:
                    print("该用户不存在。")

    return inter


@auth
def foo():

   print(“

请先验证”)

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，

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。

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

def time_count(func):
    def hide(*args, **kwargs):
        star = time.time()
        func(*args, **kwargs)
        end = time.time()
        print('本程序执行耗时{}秒'.format(end - star))

    return hide


def login_check_1(func):
    def hide(*args, **kwargs):
        count = 1
        while count:
            login_name = input('输入登录账号：').strip()
            login_pwd = input('输入登录密码：').strip()
            with open(r'user.txt', mode='rt', encoding='utf-8')as f:
                for check_info in f:
                    check_list = check_info.strip().split(':')
                    if login_name == check_list[0] and login_pwd == check_list[1]:
                        print('===登录成功，后续程序将继续执行===')
                        count = 0
                        break
                else:
                    print('用户名或密码错误，重新输入')
        func(*args, **kwargs)

    return hide


def login_check_2(func):
    def hide(*args, **kwargs):
        tag = 1
        while tag:
            login_name = input('输入登录账号：').strip()
            login_pwd = input('输入登录密码：').strip()
            with open(r'02 账号库.txt', mode='rt', encoding='utf-8')as file:
                for check_info in file:
                    check_list = check_info.strip().split(':')
                    if login_name == check_list[0] and login_pwd == check_list[1]:
                        print('===登录成功，后续程序将继续执行===')
                        login_star_time = time.time()
                        func(*args, **kwargs)
                        input('模拟操作时间')
                        login_end_time = time.time()
                        do_time = login_end_time - login_star_time
                        if do_time < 6:
                            tag = 0
                        else:
                            print('操作超时，重新登录')
                        break
                else:
                    print('用户名或密码错误，重新输入')

    return hide


def add(a, b):
    time.sleep(1)
    print('功能：{}'.format(a + b))