购物车作业详解

买家  卖家  商品  金钱

# 把货物放在货架上
li = [
    {'name':'苹果', 'price':1},
    {'name':'香蕉', 'price':1},
    {'name':'西瓜', 'price':10},
    {'name':'橘子', 'price':0.5},
]
shopping_car = {}           # 建立一个空购物车
print('欢迎光临水果店')
money = input('让我看看你有多少钱:')
if money.isdigit() and int(money) > 0:
    while 1:
        for i,k in enumerate(li):
            print('序号:{}	商品:{}	价格:{}'.format(i, k['name'], k['price']))
        choose = input('请输入您要购买的商品序号:')
        if choose.isdigit() and int(choose) < len(li):
            num = input('您要购买的商品数量:')
            if num.isdigit():
                if int(money) > li[int(choose)]['price'] * int(num):
                    money = int(money) - li[int(choose)]['price'] * int(num)
                    if li[int(choose)]['name'] in shopping_car:
                        shopping_car[li[int(choose)]['name']] += int(num)       # 若商品已经在购物车中, 则增加数量
                    else:
                        shopping_car[li[int(choose)]['name']] = int(num)
                    print('购物车中的商品有:{}		您的余额为:{}'.format(shopping_car,money))
                else:
                    print('余额不足')
                    break
        else:
            print('您输入的序号有误')