type error

#Letter game

import random

#make a list of words
words = [
    'apple',
    'banana',
    'orange',
    'coconut',
    'strawberry',
    'lime',
    'grapefruit',
    'lemon',
    'kumquat',
    'blueberry',
    'melon'
]

while True:
    start = input("Press enter/return to start or press q to quit ")
    if start.lower() == 'q':
        break
    #pick a random word
    secret_word = random.choice(words)
    bad_guesses = []
    good_guesses = []

    while len(bad_guesses) < 7 and len(good_guesses) != len(list(secret_word)):
    #draw spaces
    #draw guessed letters and strikes
        for letter in secret_word:
            if letter in good_guesses:
                print(letter , end ='')
            else:
                print('_' , end ='')

        print('')
        print('Strikes {}/7'.format(len(bad_guesses)))
        print('')
    #takes guess
        guess = input("Guess a letter ").lower

        if len(guess) != 1:
            print("You can only guess a single letter")
            continue
        elif guess in bad_guesses or guess in good_guesses:
            print("You have already guessed that letter")
            continue
        elif not guess.isalpha():
            print("You can only guess letters")
            continue
        #print out win/lose
        if guess in secret_word:
            good_guesses.append(guess)
            if len(good_guesses) == len(list(secret_word)):
                print("You win! the word was {}".format(secret_word))
                break

        else:
            bad_guesses.append(guess)

    else:
        print("You didnt get it! My secret word was {}".format(secret_word))

if len(guess) != 1