Creating guest list manager

[deanhystad]

What is your thinking here:

    elif choice == '2':
        new_guest = float(input('\nPlease enter a new guest.: '))
        if new_guest == 0:
            print('That name is already on the list')
        elif new_guest == 0:  # <-  Why the duplicate??
        else:
            guestlist.append(new_guestlist)

Wouldn't new_guest be a name? The guests in guest_list are names, so why are you changing the input to a float?

After you fix the input so new_guest is a name (str), how can you verify the name is not IN guest_list?

If zero is entered aren't you supposed to exit the loop? How does this exit the loop?

    if choice == '0':
        print('\nThank you for using guest list manager.')

From the assignment it sounds like you are supposed change a "while loop condition". Your while loop condition is "True". You can't change that. How can you make a condition that you can change from True to False?