def num_check(question, low, high):
    """Checks user enters a number (integer or float) between low and high inclusive."""

    error = f"Oops - please enter a number between {low} and {high}."

    while True:
        try:
            response = float(input(question))

            if low <= response <= high:
                return response
            else:
                print(error)
        except ValueError:
            print(error)

#main loop goses here
while True:
    print()


    my_num = num_check(f"chose a number",1,20000)
    print(f"You chose {my_num}")