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]
