a.py

import random

num = random.randrange(0, 10)
while True:
    str = input("guess between 0 to 9 or type exit ")
    if str == "exit":
        break
    if not(str.isalnum()):
        print("not a valid input ")
        continue
    str = int(str)
    if str == num:
        print("you guessed correctly ")
        break
    elif str > num:
        print("you guessed too high ")
    else:
        print("you guessed too low ")