Getting error on guesses.appened(guess), it says object has no attribute

import random

# safely make an int 
# limit guesses
# too high message
# too low message
# play again

def game():

    secret_num = random.randint(1,20)
    guesses = []

    while len(guesses) < 5:
        try:
          # get a number guess from the player
          guess = int(input("Guess a number between 1 and 20: "))
        except ValueError:
            print("{} isn't a number!".format(guess))
        else: 


            # compare guess to secret number
            if guess == secret_num:
                print("You got it! My number was {}".format(secret_num))
                break
            else:
                print("that's not it, but guess again!")
            guesses.appened(guess)

game()