基本购物车的编写

print(‘欢迎光临本店！‘.center(50,‘-‘))
goods = [
    {‘name‘:‘苹果‘,‘price‘:10},
    {‘name‘:‘梨子‘,‘price‘:12},
    {‘name‘:‘香蕉‘,‘price‘:15},
    {‘name‘:‘橘子‘,‘price‘:18},
    {‘name‘:‘葡萄‘,‘price‘:20}
]
shopping_car = []
balance = 0
while 1:
    print(‘‘‘
        请选择你的操作
        1.充值
        2.购买商品
        3.查看购物车
     ‘‘‘)
    user_choose = input(‘请选择1～3，输入q或者Q退出：‘)
    if user_choose.upper() == ‘Q‘:
        print(‘欢迎下次光临！‘.center(50,‘*‘))
        break
    elif user_choose == ‘1‘:
        Add_balance = input(‘请输入充值的金额‘)
        if Add_balance.isdigit():
            balance += int(Add_balance)
            print(‘你当前的金额为{}‘.format(balance))
        else:
            print(‘输入有误，请重新输入‘)
    elif user_choose == ‘2‘:
        while 1:
            print(‘商品信息如下：‘.center(50,‘-‘))
            for i, k in enumerate(goods):
                print(‘序号:{}\t商品:{}\t价格:{}{}‘.format(i, k[‘name‘], k[‘price‘], ‘元‘))
            print(‘请选择你需要购买的商品‘.center(50, ‘-‘))
            user_choose_goods = input(‘请选择0～{},输入q或者Q退出‘.format(len(goods)-1))
            if user_choose_goods.upper() == ‘Q‘:
                break
            elif 0 <= int(len(user_choose_goods)) < len(goods):
                shopping_car.append(goods[int(user_choose_goods)])
            else:
                print(‘输入有误，请重新输入‘)
    elif user_choose == ‘3‘:
            count = 0
            print(f‘ \t 序号 \t 名称 \t\t 价格‘)
            for i in range(len(shopping_car)):
                print(‘ \t {} \t\t {} \t\t {}‘.format(i,goods[i+1][‘name‘],goods[i+1][‘price‘]))
                count += int(shopping_car[i][‘price‘])
            print(‘‘‘
            总价:      {}
            余额：     {}
            输入n结算，输入商品序号0～{}删除商品
            ‘‘‘.format(count,balance,len(shopping_car)-1))
            while 1:
                user_choose_shop = input(‘请输入【q或Q返回上一级】,【0～{}删除对应商品】,【n结算】‘.format(len(shopping_car)-1))
                if user_choose_shop.upper() == ‘Q‘:
                    break
                elif user_choose_shop.upper() == ‘N‘:
                    if count <= balance:
                        balance = balance - count
                        print(‘结算成功，当前余额为{}‘.format(balance))
                        break
                    else:
                        print(‘余额不足，请充值‘)
                        break
                elif 0 < int(user_choose_shop) <= (len(shopping_car))+1:
                    del_goods = shopping_car.pop(int(user_choose_shop)-1)
                    print(‘您删除了{}‘.format(del_goods))
                else:
                     print(‘输入有误，请重新输入‘)
    else:
         print(‘输入有误，请重新输入‘)