請選擇你要購買的商品序號(按q退出)：3
你已購買['iphone', 'xiaomi'],總共花費2998，當前可用餘額:17002
商品列表如下：
1-['iphone', 999]
2-['lv bag', 666]
3-['xiaomi', 1999]
4-['honor', 2999]
5-['oppo', 2999]

def shop_1(_salary,lists,allpay):
    x=int(_num)
    if int(_salary) < int(lists[x][1]):
        print(f"對不起，你的餘額不足,無法購買此商品，當前可用餘額為{_salary}")
        return _salary, lists,  allpay
    else:
        _salary = int(_salary) - int(lists[x][1])
        shoplist.append(lists[x][0])
        allpay += int(lists[x][1])
        print(f"你已購買{shoplist},總共花費{allpay}，當前可用餘額:{_salary}")
        return _salary,lists,allpay


lists = [['iphone',999],['lv bag',666],['xiaomi',1999,],['honor',2999],['oppo',2999]]
_salary = input("please input your salary:")
allpay = 0
shoplist = []
while True:
    print("商品列表如下：")
#    for list in lists:
#        print(f"{lists.index(list)}-{list}")
    for index,list in enumerate(lists):
        print(f"{index} - {list}")
    _num = input("請選擇你要購買的商品序號(按q退出)：")
    if _num.isdigit():
        _num = int(_num)
        if _num < len(lists) and _num >= 0:
            choice = lists.index(lists[_num])
            if _num == choice:
                (_salary, lists, allpay) = shop_1(_salary, lists, allpay)
        else :
            print("你輸入的序號不存在，請重新輸入：")
    else:
        if _num == 'q':
            print("歡迎下次光臨！")
            print(f"你已購買{shoplist},總共花費{allpay}，當前可用餘額:{_salary}")
            exit()
        else:
            print("請選擇正確的商品序號。")