python shopping

li = [
    {'name':'苹果','price':10},
    {'name':'香蕉','price':20},
    {'name':'西瓜','price':30}
]
shopping_car ={}
print('welcome')
money = input('How much money you have?:')
if money.isdigit()and int(money)>0:
    for i,k in enumerate(li):
        print('序号{},商品{},价格{}'.format(i,k['name'],k['price']))
    num_choice = input('请输入商品序号: ')
    if num_choice.isdigit():
        if int(num_choice) <= len(li) and int(num_choice)>=0:
            while 1:
                num = input('请输入商品数量:')
                if num.isdigit():
                    print('你要买的是{},\n数量是{}'.format(li[int(num_choice)]['name'], num))
                    print('确认购买请输入 Y')
                    con_purchase =input().upper()
                    if con_purchase == 'Y':
                        print('请去结算')
                        if int(money) >= (int(li[int(num_choice)]['price']) * int(num)):
                            money = int(money)-li[int(num_choice)]['price'] * int(num)
                            print('购买成功,你的余额是 {}'.format(money))
                            break
                        else:
                            print('余额不足,请重新选择数量:')
                            continue
                else:
                    print('请输入正确的数量:')
    else:print('请输入正确的商品序号')
else:print('没钱请回家拿钱')