python 购物车

#_author_: edison
#date: 2017/8/8
salary = int(input('please input your salary:'))
flag = True
a = [1,2,3,4,5]
b = ['iphone7','mac pro','coffee','bicycle','shoes']
c = [5600,10988,32,988,699]
product = []
for i in range(5):
    print(a[i],b[i],c[i])
while flag:
    number = int(input('输入你想购买商品的号数:'))  # 转化成整形
    for i in range(5):
        if a[i] == number:
            price_spread = salary-c[i]
            if price_spread >= 0:
                print(b[i],'也加入你的购物车'+'当前余额：',price_spread)
                product.append(i)
                sentence = input('go on or quit?')
                if sentence == 'quit':
                    flag = False
                    print('你购买了以下产品：')
                    cost_money = 0
                    for i in product:
                        print('商品：',b[i],'价格：',c[i])
                        cost_money = cost_money + c[i]
                    print('你本次消费：',cost_money)
                else:
                    salary = price_spread
            else:
                print('余额不足:')
# for i in product:
#     cost_money = 0
#     cost_money = cost_money + c[i]
# print('你本次消费：',cost_money)
print('你的余额为：',price_spread,'欢迎下次光临！')