To avoid the "invalid literal for int() with base 10: 'blue' message in case the user enters "blue"

TICKET_PRICE = 10

tickets_remaining = 100
while tickets_remaining:
    print("There are {} tickets available.".format(tickets_remaining))
    name = input("What is your name? ")
    num_tickets = input("How many tickets do you need {}? ".format(name))
    try:
        num_tickets = int(num_tickets) 

    except ValueError:
        print("Please enter a valid value!")
    else:    
        if num_tickets > tickets_remaining:
            print("There are only {} tickets available!".format(tickets_remaining))

        else:
            amount_due = num_tickets * TICKET_PRICE
            print("The total cost for {} tickets is £{}.".format(num_tickets, amount_due))
            confirmation = input("Would you like to continue with the purchase? Y/N  ")

            if confirmation.lower() == "y":

                print("Sold!")
                tickets_remaining -= num_tickets
            else:
                print("Thank you for your interest {}, good bye!".format(name))
else:
    print("All tickets are now SOLD OUT! Good Bye!")