python---购物车

购物车功能如下：

1. 输入收入多少，购买商品

2. 打印购物清单，根据清单选择商品；

3. 结算，打印购物清单及总金额

 # -*- coding:utf-8 -*-
 # LC

 goods=[[1,'iphone',5800],[2,'Mac Pro',12000],[3,'apple',30],[4,'egg',5],[5,'pig',2000]]         #商品列表
 salary = input('Please input your salary:')                                                       #输入薪资
 shopping_cart = []                                           #购物车列表
 shopping_money=[]                                           #消费金额列表
 salary=int(salary)
 balance=int(salary)                                         #消费余额，未开始消费等于薪资
 shopping_total_money=0
 while True:
     for i in goods:                                         #打印商品清单
         print(i)
     select = input("Please input your select,or input 'q' to quit:")        #输入购买清单选项，按"q"退出
     if select=="q":
         if balance==salary:                                                         #判断是否购买了东西
             print("Do not buy any thing")
             break
         else:
             print("You have been bought below:")
             for k in shopping_cart:
                 print(k)
             print("Total Comsume:",shopping_total_money)
             break
     else:
         select_sequence = int(select)
         goods_max_sequence = int(goods[-1][0])
         if select_sequence>goods_max_sequence:                                        #如果输入序列号大于商品序列号，提示输入错误
             print("------------Warning-------------")
             print("Your selected is not correctly,please retry")
             print("------------Warning-------------")
         else:
             goods_price = int(goods[select_sequence - 1][2])
             if goods_price<=balance:                                                #如果余额大于购买商品的金额，则加入购物车
                 shopping_cart.append(goods[select_sequence-1])
                 shopping_money.append(goods_price)                              #消费金额加入消费金额列表
                 shopping_total_money = sum(shopping_money)                      #计算商品总金额
                 shopping_total_money=int(shopping_total_money)
                 balance = salary - shopping_total_money                         #余额计算
             else:
                 print('You have not enough money!')                 #余额不足，提示购买清单
                 for k in shopping_cart:
                     print(k)
                 print("Total Comsume:", shopping_total_money)
                 break

打印列表index，序号

 product_list = [["apple",180],["pig",1800],["rice",5],["bike",500]]
 for item in product_list:
     print(product_list.index(item),item)

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

执行代码结果：

0 ['apple', 180]
1 ['pig', 1800]
2 ['rice', 5]
3 ['bike', 500]
0 ['apple', 180]
1 ['pig', 1800]
2 ['rice', 5]
3 ['bike', 500]