python 购物车+用户认证程序

创建文件a.txt,b.txt.c.txt用于存放应该持续保存的信息

a.txt ：用户密码输入错误3次就锁定

b.txt ：购物时的活动，每个用户只能参与一次

c:txt ：购物完后的发票在这里查看

 

购物车程序：

 ready = 0
    salary = input("how much is  you salary:")
    out = 0
    #count = 0
    if salary.isdigit():
        salary = int(salary)
    else:
        exit("input string not digital....exit")
    list = [["精选猪肉3斤", 100], ["牛肉3斤", 200], ["鸡肉三斤", 50]]
    shoppingcar = []
    while True:
        print("----------------------------------------------------------------------------")
        print("Welcome to  xiaodai store")
        print("\033[31;1m目前正在做活动，购买商品满500的话就赠送一个精美的杯子哦!!!（超市内按h咨询）每人限1次 \033[0m")
        for i in enumerate(list):
            info_l = i[0]
            info_n = i[1][0]
            info_m = i[1][1]
            print(info_l, info_n, info_m)
        user_c = input("please input your choose（h/help):")
        if user_c.isdigit():
            user_c = int(user_c)
            if user_c < len(list) and user_c >= 0:
                user_c = int(user_c)
                money = list[user_c][1]
                shoppingcar_1 = list[user_c]
                ready = ready + money
                if salary >= money:
                    shoppingcar.append(shoppingcar_1)
                    print(shoppingcar_1, "add  in then shoppingcar.....")
                    salary -= money
                else:
                    print(" ----------------------")
                    print("|your money not enough:|", salary)
                    print(" ----------------------")
            else:
                print("没有这个商品编号")
        elif user_c == "h" or user_c == help or user_c == "H":
            print("q/quit     quit store")
            print("c/check    check  shopping car and salary")
            print("0-2        choice of goods")
            print("购买完商品后,输入[F]键来参加活动（满500赠送精美杯子)")
            print("l/list  查看发票，购买完并退出超市后才能通过此方法看到发票")
        elif user_c == "q" or user_c == "quit" or user_c == "Q":
            print("your shoppingcar:", shoppingcar)
            print("Be left over  how much money:", salary)
            time_1 = '%Y-%m-%d-%X'
            time_2 = time.strftime(time_1)
            with open('b.txt', 'a', encoding='utf-8') as f2:
                f2.write("发票：%s用户 在 %s 购买了 %s 共消耗%s 元 \n" %(username,time_2,shoppingcar,ready))
            exit("quit....")
        elif user_c == 'l'or user_c =='list':
            with    open('b.txt','r+',encoding='utf-8')as f3:
                print(f3.read())
        elif user_c == "c" or user_c == "check" or user_c == "C":
            print("Be left over  how much money:", salary)
            print(shoppingcar)
        elif user_c == "f" or user_c == "F":
            if ready >= 500 :
                with    open('c.txt','r+',encoding='utf-8') as f4:
                    aready=f4.read()
                    if  username not  in aready:
                        print("你的满额任务达成,获得精美杯子一个..................")
                        shoppingcar.append(['精美杯子', 0])
                        if len(aready) != 0 :
                            f4.write('\n'+username)
                        else:
                            f4.write(username)
                    else:
                        print('你已经领取过奖励了，你的购物车：%s'%shoppingcar)
                        continue
            else:
                print("你没有满足活动的需求")
        else:
            exit("input error")

 所有代码:

import time,sys
def shopping():
    "'购物车程序，进入时输入有多少钱，然后进行商品购物，消费满500后选择接受礼品，礼品每个用户只能接受一次，接受过的用户存放在c.txt文件中,购物完毕后打印发票，发票存储在b.txt文件中，"
    ready = 0
    salary = input("how much is  you salary:")
    out = 0
    #count = 0
    if salary.isdigit():                          #判断salary是否为数字
        salary = int(salary)
    else:
        exit("input string not digital....exit")
    list = [["精选猪肉3斤", 100], ["牛肉3斤", 200], ["鸡肉三斤", 50]]
    shoppingcar = []
    while True:
        print("----------------------------------------------------------------------------")
        print("Welcome to  xiaodai store")
        print("\033[31;1m目前正在做活动，购买商品满500的话就赠送一个精美的杯子哦!!!（超市内按h咨询）每人限1次 \033[0m")
        for i in enumerate(list):    #enumerate可以在读取数据时添加一个编号在第一位，如[0,"精选猪肉3斤", 100]
            info_l = i[0]
            info_n = i[1][0]
            info_m = i[1][1]
            print(info_l, info_n, info_m)
        user_c = input("please input your choose（h/help):")
        if user_c.isdigit():
            user_c = int(user_c)
            if user_c < len(list) and user_c >= 0:
                user_c = int(user_c)
                money = list[user_c][1]
                shoppingcar_1 = list[user_c]
                ready = ready + money
                if salary >= money:
                    shoppingcar.append(shoppingcar_1)
                    print(shoppingcar_1, "add  in then shoppingcar.....")
                    salary -= money
                else:
                    print(" ----------------------")
                    print("|your money not enough:|", salary)
                    print(" ----------------------")
            else:
                print("没有这个商品编号")
        elif user_c == "h" or user_c == help or user_c == "H":
            print("q/quit     quit store")
            print("c/check    check  shopping car and salary")
            print("0-2        choice of goods")
            print("购买完商品后,输入[F]键来参加活动（满500赠送精美杯子)")
            print("l/list  查看发票，购买完并退出超市后才能通过此方法看到发票")
        elif user_c == "q" or user_c == "quit" or user_c == "Q":
            print("your shoppingcar:", shoppingcar)
            print("Be left over  how much money:", salary)
            time_1 = '%Y-%m-%d-%X'
            time_2 = time.strftime(time_1)
            with open('b.txt', 'a', encoding='utf-8') as f2:
                f2.write("发票：%s用户 在 %s 购买了 %s 共消耗%s 元 \n" %(username,time_2,shoppingcar,ready))
            exit("quit....")
        elif user_c == 'l'or user_c =='list':
            with    open('b.txt','r+',encoding='utf-8')as f3:
                print(f3.read())
        elif user_c == "c" or user_c == "check" or user_c == "C":
            print("Be left over  how much money:", salary)
            print(shoppingcar)
        elif user_c == "f" or user_c == "F":
            if ready >= 500 :
                with    open('c.txt','r+',encoding='utf-8') as f4:
                    aready=f4.read()
                    if  username not  in aready:
                        print("你的满额任务达成,获得精美杯子一个..................")
                        shoppingcar.append(['精美杯子', 0])
                        if len(aready) != 0 :   #len可以打印这个变量中是否有数据，他会显示这个文件的字数，添加这个判断是格式问题，如果文件中没有数据，责直接将数据写入进去，不加空格，如果存在数据，责在插入数据前先执行回车.
                            f4.write('\n'+username)                        #在写入内容是在输入回车，不能用逗号来区分，用加号
                        else:
                            f4.write(username)
                    else:
                        print('你已经领取过奖励了，你的购物车：%s'%shoppingcar)
                        continue
            else:
                print("你没有满足活动的需求")
        else:
            exit("input error")
def auth():
'''慢慢的显示验证中'''
    for i in range(1):
        sys.stdout.write("验")
        sys.stdout.flush()
        time.sleep(0.3)
        sys.stdout.write("证")
        sys.stdout.flush()
        time.sleep(0.3)
        sys.stdout.write("中")
        sys.stdout.flush()
        time.sleep(0.3)
        sys.stdout.write("请")
        sys.stdout.flush()
        time.sleep(0.3)
        sys.stdout.write("稍")
        sys.stdout.flush()
        time.sleep(0.3)
        sys.stdout.write("等")
        sys.stdout.flush()
        time.sleep(0.3)
user_list={
    'xiaoming':{'xiaoming1'},
    'xiaogang':{'xiaogang1'},
    'xiaomei':{'xiaomei1'}
}
with open('a.txt','r+',encoding='utf-8')as f:
    lock_list=f.read()
    count=0
    username = input(' please input your  user name:')
    for l in range(100):
        passwd = input('\033[31;3m please input your passwd:\033[1m')
        for i in  user_list:
            auth()
            print('\n')
            if  username in lock_list :
                print("用户已被锁定")
                break
            elif username  not in  user_list  :
                print('用户不存在')
                username = input(' please input your  user name:')
                break
            else:
                a=user_list[username]
                if  passwd  in a :
                    print('登录成功')
                    shopping()
                elif count >= 3:
                    print("密码错误次数过多，用户%s被锁定，如需解锁，请联系管理员"%username)
                    f.write(username)
                    f.write('\n')
                    exit('quit...')
                else:
                    print('密码错误登录失败,请重试')
                    count = count + 1
                    break                                  #为了确保如"密码错误登录失败,请重试"提示只提示一次，而不是按照for循环的提示多次，当执行完后就退出for循环，退出后又继续加载这个循环。