Python练习_购物车_day6

第一次代码

(1) 输出商品列表,用户输入序号,显示用户选中的商品.

页面显示 序号 + 商品名称,如:
1 手机
2 电脑

(2): 用户输入选择的商品序号,然后打印商品名称

(3):如果用户输入的商品序号有误,则提示输入有误,并重新输入。

(4):用户输入Q或者q,退出程序。

flag = True
while flag:
    li = ['手机', '电脑', '鼠标垫', '游艇']
    for i in li:
        print('{}\t{}'.format(li.index(i) + 1, i))
    num_of_choose = input('请输入选择的商品序号(按Q退出,不区分大小写):')
    if num_of_choose.isdigit():
        num_of_choose = int(num_of_choose)
        if num_of_choose > 0 and num_of_choose <= len(li):
            print(li[num_of_choose - 1])
        else:print('请输入有效数字!')
    elif num_of_choose.upper() == 'Q':
        flag = False
    else:
        print('请输入整数!')

升级

功能要求:

要求用户输入总资产,例如:2000

显示商品列表,让用户根据序号选择商品,加入购物车购买,如果商品总额大于总资产,提示账户余额不足,否则,购买成功。

goods = [
    {"name": "电脑", "price": 1999},
    {"name": "鼠标", "price": 10},
    {"name": "游艇", "price": 20},
    {"name": "美女", "price": 998}
    ]
total = 0
flag = True
money = input('请输入您的总资产:')
while flag:
    for i in goods:
        print('{}\t{}\t{}'.format(goods.index(i) + 1, i['name'], i['price']))
    num_of_choose = input('请选择商品的序号(按Q退出,不区分大小写):')
    if num_of_choose.isdigit():
        num_of_choose = int(num_of_choose)
        if num_of_choose > 0 and num_of_choose <= len(goods):
            total = total + goods[num_of_choose - 1]['price']
            if total < int(money):
                print('成功加入购物车!')
                print('你当前选择的商品为:{}\t价格为:{}'.format(goods[num_of_choose - 1]['name'],goods[num_of_choose - 1]['price']))
                print('总价为:{}'.format(total))
            else:
                print('账户余额不足!')
                flag = False
        else:print('请输入有效数字!')
    elif num_of_choose.upper() == 'Q':
        flag = False
    else:print('请输入整数!')

 最终

# 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:{}\t商品:{}\t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:{}\t\t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')

 

posted @ 2018-12-23 22:45  dongye95  阅读(468)  评论(0编辑  收藏  举报