python编写购物车新写法

 

用另一种方式完成购物车的功能实现

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#!/usr/bin/python zijin = input("请输入资金：") if zijin.isdigit():     zijin = int(zijin) else:     print("请输入数字！") exit_flag = False print("欢迎来到本人的购物小店".center(40,"-")) shop_list = [     ("电脑", 1999),     ("鼠标", 800),     ("键盘", 299),     ("鼠标垫", 100) ] gouwuche = [] xiaofei = 0 while exit_flag is not True:     print("商品列表如下：".center(44,"-"))     for item in enumerate(shop_list):         index = item[0]         sp_name = item[1][0]         sp_price = item[1][1]         print(index, ".", sp_name, sp_price)     user_choice = input("请输入商品编号进行购买：")     if user_choice.isdigit():         user_choice = int(user_choice)         if user_choice < len(shop_list):             sp_item = shop_list[user_choice]             if sp_item[1] <= zijin:                 gouwuche.append(sp_item)                 zijin -= sp_item[1]                 xiaofei += sp_item[1]                 print("您成功购买了：[%s] 花费了：[%s] 余额为：[%s]" %(sp_item[0], sp_item[1], zijin))             else:                 print("您的金额不足！还差 [%s] 才能购买此商品！" %(sp_item[1] - zijin))     else:         if user_choice == "q" or user_choice == "quick":             print("您本次购买了如下商品：".center(40, "-"))             for g_list in gouwuche:                 print(g_list)             print("结束".center(45, "-"))             print("您总共消费了：[%s] 余额为：[%s]" %(xiaofei, zijin))             exit_flag = True