Lewis's Guessing Game

import random

def get_num():
    while True:
        try:
            guess = input("Input your guess: ")
            guess = int(guess)
        except ValueError:
            print(f"{guess} isn't a number you twat!")
            continue
        return guess

rand = random.randint(0, 100)

guess_is_correct = False
while guess_is_correct == False:
    guess = get_num()
    if guess < rand:
        print("Too low!")
    elif guess > rand:
        print("Too big!")
    else:
        print("You won!")
        guess_is_correct = True