购物车

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author: liang
#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author: liang
import sys,os,sys
commodity_list=[
    (‘IPhone‘,5600),
    (‘Max Pro‘,1200),
    (‘book‘,120),
    (‘Girl friend‘,2800),
    (‘English‘,400)
]

shopping_list=[]


f3=open(‘ming.txt‘,‘a‘,encoding="utf-8")
f=open("salary.txt",‘a‘,encoding="utf-8")
f2=open("salary.txt",‘r+‘,encoding="utf-8")


salary=input("请输入你的工资：")

if salary.isdigit():
    salary=int(salary)
    while True:

        for index, item in enumerate(commodity_list):
                print(index,item)

        user_choie=input("你需要购买什么？：")
        if user_choie.isdigit():
            user_choie=int(user_choie)

            if user_choie < len(commodity_list) and user_choie >=0:
                p_item=commodity_list[user_choie]

                if p_item[1] <= salary:
                    salary -= p_item[1]
                    p_item = str(p_item)
                    f.write(p_item + ‘\n‘)

                    f.flush()

                    a=("你购买的商品是%s，你的余额还有%s"%(p_item,salary))
                    print(a)
                    f3.writelines(a+‘\n‘)
                else:
                    print("你的余额只有%s，那你还买个屁啊！！"%(salary))

            else:
                print("尚品不存在")

        elif user_choie == ‘q‘:
            print("----------shopping list---------")
            print(f2.read())
            exit("你的余额为%s"%(salary))

        else:
            print("你输入的有误！!。请重新输入！！！")

else:
    print("你输入的有误！！请从新输入")

你购买的商品是(‘book‘, 120)，你的余额还有39880
你购买的商品是(‘Girl friend‘, 2800)，你的余额还有37080
你购买的商品是(‘English‘, 400)，你的余额还有36680

(‘book‘, 120)
(‘Girl friend‘, 2800)
(‘English‘, 400)