Python——购物车程序（列表的应用）

购物车基本功能：
1.展示购物清单、价格信息。
2.由客户选择商品序号、加入购物车。
3.结束购物后，展示购物车中的商品信息，余额信息。
其他规则：所选商品价格超出当前余额时，提示钱不够；
                直到客户输入quit，退出购物；

# !/usr/bin/env python3.6
# -*- coding: utf-8 -*-
# __author__:  Ed Frey
# Date: 18/7/24

# 购物车程序

salary = 20000

goods_list = ['iphone6s', 'macbook', 'coffee', 'python book', 'bicycle']
goods_price = [5800, 9000, 32, 80, 1500]
print('-------the list of goods and price------')
for i in goods_list:
    print("%d.\t%s\t%d" % (goods_list.index(i) + 1, i, goods_price[goods_list.index(i)]))
print('-' * 40)

bicycle = []
list = ['1', '2', '3', '4', '5']
balance = salary

while True:
    select = input("please choose the number of goods(input quit to exit):")

    if select in list:
        select = int(select) - 1

        if balance < goods_price[select]:
            print('your balance is not enough,%d' % balance)
        else:
            bicycle.append(goods_list[select])
            balance -= goods_price[select]
            print('''%s\t%d
has been put into your bicycle,the current balance is %d
                  ''' % (goods_list[select], int(goods_price[select]), balance))
    elif select == 'quit':
        print('your purchase list:')

        for i in goods_list:
            if i in bicycle:
                j=bicycle.count(i)
                print("%s\t%d\t*%d" % (i, goods_price[goods_list.index(i)],j))
        print('\r\nyour balance is %d\r\nYour are welcome!' % balance)
        break
    else:
        print('invalid input! please input again.')

salary = 20000
goods_list = [
    ('iphone6s',5800),
    ('macbook',9000),
    ('coffee',32),
    ('python book',80),
    ('bicycle',1500)]
bicycle = []
balance = salary

while True:
    print('-------the list of goods and price------')
    for i, v in enumerate(goods_list, 1):# enumerate函数可以加序号，第二个参数是第一个序号初始值，如果为空从0开始。
        print(i, '>>>', v)
    print('-' * 40)
    select = input("please choose the number of goods(input quit to exit):")

    if select.isdigit():
        select = int(select) - 1
        if select in range(len(goods_list)):#len函数的使用，便于商品列表更新，不需要再维护可选商品序号。
            if balance < goods_list[select][1]:
                print('your balance is not enough,%d' % balance)
            else:
                bicycle.append(goods_list[select])
                balance -= goods_list[select][1]
                print('''%s
has been put into your bicycle,the current balance is %d
                      ''' % (goods_list[select], balance))
        else:
            print('invalid input! please input again.')
    elif select == 'quit':
        print('————————————————————————————————————————————————————————\r\nyour purchase list:')
        for i in goods_list:
            if i in bicycle:    #将加入购物车中的商品进行分类计数、展示
                j=bicycle.count(i)
                print("%s\t*%d" % (i,j))
        print('\r\nyour balance is %d\r\nYour are welcome!' % balance)
        break
    else:
        print('invalid input! please input again.')