2 -15 -2 购物车扩展需求

import time
import os
goods = [
    {"name": "电脑", "price": 100},
    {"name": "鼠标", "price": 10},
    {"name": "游艇", "price": 1000},
    {"name": "美女", "price": 1},
]

shopping_cart = []
_username = "alex"
_password = "123"
count = 0


while count < 3:#用户名密码循环1
    username = input("\033[1;32m请输入用户名:\033[0m").strip()
    password = input("\033[1;32m请输入密码:\033[0m").strip()
    if username == _username and password == _password:
        print("\033[1;34m-----登录成功，欢迎%s\033[0m" % username)



        #得到工资
        with open("salary", 'r') as f1:
            data = f1.read()
        if data:
            salary = float(data)
            print("\033[1;31m你的余额还有：%s\033[0m" % salary)
        else:
            while True:#工资循环2
                salary = input("\033[1;32m请输入你的工资：\033[0m").strip()
                if salary.isdigit():#只能够吧3456转换，不能转换3456.444，
                    salary = float(salary)
                    break
                else:
                    print("输入有误，重新输入")

        while True:         #商品列表循环3
            print("————————商品列表——————————")
            for index, item in enumerate(goods):
                print("%s   %s   %s "%(index,item["name"], item["price"]))
            choice = input("\033[1;34m输入要买的商品编号|查看消费记录b|退出q:\033[0m").strip()
            if choice.isdigit():
                choice = int(choice)
                if choice < len(goods):
                    if salary >= float(goods[choice]["price"]):
                        shopping_cart.append([goods[choice]["name"],goods[choice]["price"]])\

                        #消费记录加入文件
                        with open("shopping_records", 'a') as f:
                            now_time = time.ctime()
                            goods_choice = [goods[choice]["name"],goods[choice]["price"]]
                            records = str(now_time) + "\t" + str(goods_choice) + "\n"
                            f.write(records)

                        print("\033[1;32m>你购买了%s\033[0m"%goods[choice]["name"])
                        salary -= float(goods[choice]["price"])
                        print("\033[1;31m>余额剩余%s\033[0m"%salary)
                    else:
                        print("033[1;31m余额不足,请重新选择\033[0m")
                else:
                    print("\033[1;31m你输入的商品不存在\033[0m")

            elif choice == "b":
                with open("shopping_records", 'r')as f:
                    records = f.read()
                    if len(records):
                        print("——————消费记录——————")
                        print(records)
                    else:
                        print("\033[1;31m>>你还没用买过东西\033[0m")

            elif choice == "q":
                if len(shopping_cart) > 0:
                    print("\033[1;32m_____你的购物车————————")
                    for index , item in enumerate(shopping_cart):
                        print(index,item[0],item[-1])
                    print("——————————————————————————")
                    print("你的余额：%s\033[0m"%salary)


                    with open("salary", "w")as f2:
                        f2.write(str(salary))
                    exit()
            else:
                print("\033[1;31m你的购物车为空，你的余额：%s\033[0m"%salary)
                with open("salary", "w") as f2:
                    f2.write(str(salary))
                exit()
        else:
            print("\033[1;31;47m你输入有误，重新输入\033[0m")
    else:
        print("\033[1;31;47m用户名或者密码错误\033[0m")
    count += 1
print("you have try more times")