Python自动化开发-EX03(购物车实现)

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author:DaShuang.Gu
'''要求：
买家
1.商品信息存在文件里
2.已购商品，余额记录。第一次启动程序时需要记录工资，第二次启动程序时显示出上次余额
3.允许用户根据商品编号购买商品
4.用户选择商品后，检测是否够，够就直接扣款，不够就提醒
5.可随时退出，退出时，打印移购买商品和余额
商家入口：
可以添加商品，修改商品价格，运行程序输出第一级菜单

 
'''
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',120),
]
shopping_list = []
user_salary = input("请输入你的薪水：")
if user_salary.isdigit():
    user_salary = int(user_salary)
while True:
    #打印出商品信息
    print('Product list'.center(30, '*'))
    for index,item in enumerate(product_list):
        print(index,item)
    #break
    shopping_number = input("输出你要买的商品编号：")
    if shopping_number.isdigit():
        shopping_number = int(shopping_number)
        if shopping_number < len(product_list) and shopping_number >= 0:
            p_item = product_list[shopping_number]
            if user_salary >= p_item[1]:
                shopping_list.append(p_item)
                user_salary -= p_item[1]
                print("商品%s加入到购物车，还有余额%s" % (p_item, user_salary))
            else:
                print('余额不足%s' % user_salary)
        else:
            print('输入的产品编号不存在')
    elif shopping_number == 'q':
        print('shopping list'.center(30,'*'))
        for i in shopping_list:
            print(i)
        print("还乘余额%s"%user_salary)
        exit()