购物车程序：

1 #! /usr/bin/env python 2 # -*- coding:utf-8 -*- 3 # Author:ShiShen 4  5 product_list = [ 6     ('Iphone' ,5800), 7     ('Mac' ,12000), 8     ('Bike' ,900), 9     ('Coffee' ,31),10     ('Alex python' ,100),11     ('watch',4000)12      ]13 shoppingcart_list = []14 salary = input("input your salary:" )15 if salary.isdigit():16     salary = int (salary)17     while True :18         for index,item in enumerate(product_list) :19             #print(product_list.index(item),item)20             print (index,item)21         user_choise = input("选择商品：")22         if user_choise.isdigit():23             user_choise = int(user_choise)24             if user_choise <= len(product_list) and  user_choise >= 0:25                 p_item = product_list[user_choise]26                 if p_item[1] <= salary:27                     shoppingcart_list.append(p_item)28                     salary -= p_item[1]29                     print("Added %s into shopping cart,your current balance is \033[31;1m %s \033[0m" %(p_item,salary))30                 else :31                     print("\033[41;1m 你的余额只有：%s,请充值\033[0m"%(salary))32             else:33                 print ("你选的商品%s不存在"%user_choise)34 35         elif user_choise == "q":36             print("-------shopping list-------")37             for p in shoppingcart_list:38                 print(p)39             print("你余额：",salary)40             exit()41         else :42             print("请输入正确的商品编号：")43 else :44     print("输入错误，请输入正确的工资:")