用户输入错误的变量类型后，我无法更改“ buyTickets”变量

while buyTickets != int:
    try:
        buyTickets = int(input("{}, how many tickets do you want to buy: ".format(userName)))
        while buyTickets == 0:
            print("You must buy atleast 1 ticket to continue")
            buyTickets = input("{}, how many tickets do you want to buy: ".format(userName))
        ticketCal(buyTickets)
    except ValueError:
        print("Unauthorized Value")
        pass