5.初探python之简单购物车

简单购物车功能：输入现有金额，选择购物，判断金额是否充足，结束打印当前所购物品，剩余金额等

goods_list = (('tesla',900000),('mate 10',4000),('apple x',7000),('bens',1000000),('movie',45),('bicycle',1500))
shopping_car = []
print('==========  welcome to my shop  ==========')
for i,v in enumerate(goods_list,1):
    print(i,'-->',v)
print('==========================================')
saving = input('please input your saving:')
if saving.isdigit():
    saving = int(saving)
    while True:
        choice = input('plesse input your choice:')
        if choice.isdigit():
            choice = int(choice)
            if choice>0 and choice<=len(goods_list):
                choice_goods = goods_list[choice-1]
                #print(choice_goods)
                if saving >= choice_goods[1]:
                    saving-=choice_goods[1]
                    shopping_car.append(choice_goods)
            else:
                print('please input correct number!')
        elif choice == 'q':
            print('============ your shopping car ============')
            for i in shopping_car:
                print(i)
            print('you hava %s'%saving)
            break
        else:
            print('please input correct number!')

else:
    print('please input correct number!')