Simple Python Random Number Guesser

I've just written a quick script guessing a random number. Though the last line of the script 'Congrats you won etc' isn't running. Also in some interpreters it is giving an error 'Failed to run script'.

import random 
attempts = 0
secret_number = random.randint(1,100)
isCorrect = False
guess = int(input("Take a guess: ")) 

while secret_number != guess: 
    if guess < secret_number:
        print("Higher...")
        guess = int(input("Take a guess: "))
        attempts+= 1 
    elif guess > secret_number:
        print("Lower...")
        guess = int(input("Take a guess: "))
        attempts+= 1 
    else:
        print("\nYou guessed it! The number was " ,secret_number)