Python Hangman Game Program Error

Code:
import random

def select_word():

    words_in_computer_memory = ['magazine','stars','computer','python','organisation']

    word = random.choice(words_in_computer_memory)

    return word

def is_gussed(word, guessed_letter_list):

    count=0

    for letters in word:

        if letters in guessed_letter_list:

            count+=1

    if count==len(word):

        return True

    else:

        return False

def guessed_word(word, guessed_letter_list): 

    string=""

    for key in word:

        if key in guessed_letter_list:

            string+=key

        else:

            string+="_ "

    return string

def available_letters(guessed_letter_list):

  

    string=""

    count=0

    s='abcdefghijklmnopqrstuvwxyz'

    for letter in s:

        if letter in guessed_letter_list:

            count+=1

        else:

            string+=letter

    return string

def hangman_game(word):  

    length=len(word)

    print('''------------------WELCOME TO HANGMAN GAME---------------------------

                                    O  

                                  /|\  

                                  / \  

        ''')

    print("The word you have to guess is of ",length, "letters long.")

    chances=2*len(word)

    i=0:

    guessed_letter_list=[]

    while (chances!=0):    



        if word!=guessed_word(word, guessed_letter_list):

            print("You Got", chances, "Chances.")

            print("Letters you can enter should be from these ",available_letters(guessed_letter_list))

            guess=input("ENTER A LETTER ")

            print('\n'*50)



            guessInLowerCase = guess[0].lower()      

            if guessInLowerCase  in guessed_letter_list:

                print("SORRY! YOU HAVE GUSSED THIS LETTER ALREADY! ",guessed_word(word, guessed_letter_list))

            elif guessInLowerCase not in word: 

                print(" SORRY! THE LETTER IS NOT IN WORD",guessed_word(word, guessed_letter_list))

                chances-=1

            else:

                guessed_letter_list.append(guessInLowerCase)

                print("NICE YOU GUSESSED THE RIGHT LETTER! ",guessed_word(word, guessed_letter_list))

          

        elif word==guessed_word(word, guessed_letter_list):

            print("YOU WON!")

            break



    else:

        print('''

        ********************************************

  YOU LOSS!!

                                O 

                                /|\  

                                / \  

    ******************************************''')

        print('The word was',word,)



word = select_word()

hangman_game(word)