购物车 功能要求： 要求用户输入总资产，例如：2000 显示商品列表，让用户根据序号选择商品，加入购物车 购买，如果商品总额大于总资产，提示账户余额不足，否则，购买成功。 购买成功，打印购买的商品列表 扩展： 登录验证

1 user_status = False 2 def login(): 3     name_list = [ 4         {
   'username': '张三', 'password': '123'}, 5         {
   'username': '李四', 'password': '456'}, 6         {
   'username': '王二', 'password': '789'}, 7     ] 8     global user_status 9     if user_status == False:10         username = input("请输入用户名:").strip()11         password = input("请用户密码:").strip()12         for i in name_list:13             if username == i["username"] and password == i["password"]:14                 print("login successfully")15                 user_status = True16                 break17             else:18                 print("User name or password error.")19                 exit()20     else:21         print("用户已登录，验证成功")22 23 24 def shopping():25     login()26     list_cart = []27     goods = [{
   "name": "电脑", "price": 1999},28                {
   "name": "鼠标", "price": 10},29              {
   "name": "游艇", "price": 20},30              {
   "name": "美女", "price": 998},31     ]32     gongzi = input("请输入您的工资:")33     while not gongzi.isdigit():34         print("输入内容只能由数字组成")35         gongzi = input("输入有误，请输入正确格式:")36     gongzi = int(gongzi)37     while True:38         print("商品列表".center(50, "#"))39         print("编号".center(8, " "), "名称".center(30, " "), "价格".ljust(10, " "))40         print("".center(53, "-"))41         for i in goods:42             print(str(goods.index(i)).center(10, " "), str(i["name"]).center(30, " "), str(i["price"]).ljust(10, " "))43             print("".center(53, "-"))44         bianhao = input("请您输入商品编号或q:")45         if bianhao.isdigit():46             bianhao = int(bianhao)47             if bianhao >= 0 and bianhao < int(len(goods)):48                 if (gongzi - goods[bianhao]["price"]) >= 0:49                     list_cart.append(goods[bianhao])50                     gongzi -= goods[bianhao]["price"]51                     print("\033[32;1m您的预算还有%d\033[0m" % gongzi)52                 else:53                     print("\033[1;31;1m余额不足啦...\033[0m")54             else:55                 print("您输入的商品不存在")56         elif bianhao == "q":57             break58         else:59             print("\033[32;1m您输入有误\033[0m")60     print("\033[32;1m还剩%d元\033[0m" % gongzi)61     print("购物车详情".center(50,"#"))62     print("编号".center(8, " "), "名称".center(30, " "), "价格".ljust(10, " "))63     print("".center(53, "-"))64     for i in list_cart:65         print(str(list_cart.index(i)).center(10, " "), str(i["name"]).center(30, " "), str(i["price"]).ljust(10, " "))66         print("".center(53, "-"))67 68 shopping()