def get_secret_word():
    '''
    This function gets a valid secret word from the user and returns it.
    The word is valid if it does not contain question marks and whitespace.
    '''
    while True:
        try:
            secret_word = input(('Please enter a word to be guessed\n'
            'that does not contain ? or white space: ')).lower()
        except:
            pass
        if any([i == '?' or i == ' ' or i == '\t' or i == '\n' for i in secret_word]):
            continue
        break
    print('\n'*30)
    return secret_word
#end get_secret_word

def is_game_over(display_guesses, num_of_incorrect_guesses, turns, guesses, secret_word, hidden_str):
    '''
    @returns: True if the game is over
    and false otherwise
    '''
    if correct_guess(hidden_str, secret_word):
        return True
    elif max_guesses_reached(num_of_incorrect_guesses, secret_word):
        return True
    else:
        return False

#end is_game_over

def correct_guess(hidden_str, secret_word):
    hidden_word = list(hidden_str)
    for i, letter in enumerate(hidden_word):
        if letter is not '?':
            print('You correctly guessed the secret word:', secret_word)
            return True
        else:
            return False
#end correct_guess

def max_guesses_reached(num_of_incorrect_guesses, secret_word):
    if int(num_of_incorrect_guesses) == 7:
        print('You failed to guess the secret word:', secret_word)
        return True
    else:
        return False
#end max_guesses_reached

def display_hangman(num_of_incorrect_guesses):
    '''
    displays the current figure of hangman
    first wrong guess corresponds to the rope
    @returns: body part
    '''
    num_of_incorrect_guesses = int(num_of_incorrect_guesses)
    if num_of_incorrect_guesses == 0:
        print('\n')
    if num_of_incorrect_guesses >= 1:
        print(' | ', end = '\n')
    if num_of_incorrect_guesses >= 2:
        print(' 0 ', end = '\n')
    if num_of_incorrect_guesses >= 3:
        print('/',end = '')
    if num_of_incorrect_guesses >= 4:
        print('|', end = '')
    if num_of_incorrect_guesses >= 5:
        print('\\', end = '\n')
    if num_of_incorrect_guesses >= 6:
        print('/',end = ' ')
    if num_of_incorrect_guesses >= 7:
        print('\\', end = '\n')
    else:
        pass
#end display_hangman

def display_guesses(guesses):
    '''
    displays the guesses the user has made in alphabetical order
    @returns: guessed letters
    '''
    sorted_guesses = sorted(guesses)
    print('So far you have guessed:', ', '.join(sorted_guesses))

#end display_guesses

def check_guess(guesses, secret_word, hidden_str, num_of_incorrect_guesses):
    '''
    checks whether a guess is right or wrong
    returns True when right
    false otherwise
    '''
    hidden_word = list(secret_word)
    while 0 <= int(num_of_incorrect_guesses) <= 7:
        for i, letter in enumerate(hidden_word):
            if letter in guesses:
                return True
            if letter not in guesses:
                return False

#end check_guess

def hidden_word(check_guess, secret_word, guesses):
    '''
    displays the word with letters and/or ?'s as needed
    '''
    hidden_word = list(secret_word)
    if check_guess is True:
        for i, letter in enumerate(hidden_word):
            if letter in guesses:
                hidden_word[i] = secret_word[i]
                hidden_str = ''.join(hidden_word)
    else:
        for i, letter in enumerate(hidden_word):
            if letter not in guesses:
                hidden_word[i] = '?'
                hidden_str = ''.join(hidden_word)
    print('\n'+hidden_str)
#end hidden_word

def num_of_wrong_guesses(check_guess, num_of_incorrect_guesses):
    '''
    counts the number of wrong guesses
    '''
    if check_guess is False:
        return num_of_incorrect_guesses + 1

#end num_of_wrong_guesses

def get_guess(secret_word, guesses, turns):
    '''
    get a valid guess from the user
    '''
    while True:
        try:
            guess = input('Please enter your next guess: ').lower().strip()
        except:
            pass
        if any([i == '?' for i in secret_word]):
            print('You must enter a guess.')
            continue
        if guess in guesses:
            print('You already guessed the character:', guess)
            continue
        if len(guess) > 1:
            print('You can only guess a single character.')
            continue
        else:
            guesses = guesses.append(guess)
            break
    return guesses
#end get_guess

def main():
    guesses = []
    turns = 1
    num_of_incorrect_guesses = 0
    secret_word = get_secret_word()
    hidden_str = []
    while not is_game_over(display_guesses, num_of_incorrect_guesses, turns, guesses, secret_word, hidden_str):
        check_guess(guesses, secret_word, hidden_str, num_of_incorrect_guesses)
        num_of_wrong_guesses(check_guess, num_of_incorrect_guesses)
        display_hangman(num_of_incorrect_guesses)
        hidden_word(check_guess, secret_word, guesses)
        display_guesses(guesses)
        print(num_of_incorrect_guesses)
        get_guess(secret_word, guesses, turns)
        turns += 1

#end main

if __name__ == '__main__': #if this is the main program run
  main() #run the main function