python练习---购物车

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

user_status = False
def login():
    name_list = [
        {'username': '张三', 'password': '123'},
        {'username': '李四', 'password': '456'},
        {'username': '王二', 'password': '789'},
    ]
    global user_status
    if user_status == False:
        username = input("请输入用户名:").strip()
        password = input("请用户密码:").strip()
        for i in name_list:
            if username == i["username"] and password == i["password"]:
                print("login successfully")
                user_status = True
                break
            else:
                print("User name or password error.")
                exit()
    else:
        print("用户已登录，验证成功")


def shopping():
    login()
    list_cart = []
    goods = [{"name": "电脑", "price": 1999},
               {"name": "鼠标", "price": 10},
             {"name": "游艇", "price": 20},
             {"name": "美女", "price": 998},
    ]
    gongzi = input("请输入您的工资:")
    while not gongzi.isdigit():
        print("输入内容只能由数字组成")
        gongzi = input("输入有误，请输入正确格式:")
    gongzi = int(gongzi)
    while True:
        print("商品列表".center(50, "#"))
        print("编号".center(8, " "), "名称".center(30, " "), "价格".ljust(10, " "))
        print("".center(53, "-"))
        for i in goods:
            print(str(goods.index(i)).center(10, " "), str(i["name"]).center(30, " "), str(i["price"]).ljust(10, " "))
            print("".center(53, "-"))
        bianhao = input("请您输入商品编号或q:")
        if bianhao.isdigit():
            bianhao = int(bianhao)
            if bianhao >= 0 and bianhao < int(len(goods)):
                if (gongzi - goods[bianhao]["price"]) >= 0:
                    list_cart.append(goods[bianhao])
                    gongzi -= goods[bianhao]["price"]
                    print("33[32;1m您的预算还有%d33[0m" % gongzi)
                else:
                    print("33[1;31;1m余额不足啦...33[0m")
            else:
                print("您输入的商品不存在")
        elif bianhao == "q":
            break
        else:
            print("33[32;1m您输入有误33[0m")
    print("33[32;1m还剩%d元33[0m" % gongzi)
    print("购物车详情".center(50,"#"))
    print("编号".center(8, " "), "名称".center(30, " "), "价格".ljust(10, " "))
    print("".center(53, "-"))
    for i in list_cart:
        print(str(list_cart.index(i)).center(10, " "), str(i["name"]).center(30, " "), str(i["price"]).ljust(10, " "))
        print("".center(53, "-"))

shopping()