while True:

    #asking the player how many questions they want
    rounds_number = input('How many questions do you want?(pick a number from 5-20) ')

    #checking if the player entered a number grater then 5 but lesser than 20
    if not rounds_number.isdigit() or not 5 <= int(rounds_number) <= 20:
        print('choose a number between 5 and 20')
        continue
    else:
        break