User input validation not validating correctly, any suggestions for what I may be doing wrong?

Question

I'm trying to validate user's input with a while loop so that only integers and number's greater than 8 are accepted. The code I have currently runs properly when a string is inputed and prints the correct output.

However, the problem I am running into is that when a user enters a integer less than 8 it displays the "Incorrect Input" message that I want, but when it prompts the user to enter another input. When I re-enter a integer greater than 8 it still prints "Incorrect Input" when I want it to break to the next prompt. Anyone have suggestions that I may be doing wrong? I'm not allowed to define a function for this particular assignment.

Number_List = []

while (True):
    try:
        Number_List.extend(map(int, input("Enter the length, width, and height of the room: ").split()))
    except ValueError:
        print("\nIncorrect Input. \nPlease try again. \n")
        continue

    if (Number_List[0] < 8) or (Number_List[1] < 8) or (Number_List[2] < 8):
        print("\nIncorrect Input. \nPlease try again. \n")
        continue
    else:
        break

Answer 1

It's because you are extending your list. So when you enter new inputs, the numbers are added at the end of Number_List.

Therefore Number_List[0], Number_List[1], Number_List[2] always stay the same.

To understand better, I advise you to print Number_List before the except.

To make it works you could simply replace the corresponding line to:

Number_List = list((map(int, input("Enter the length, width, and height of the room: ").split())))

With that you will create a new list every time.

Hope it helped.