Word Guess unfinished

secret_word = "hello"
dashes = "-" * len(secret_word)
def get_guess():
    while True:
        guess = input("Guess a letter: ")
        if len(guess) != 1:
            print("Please only enter one letter!")
        elif not guess.islower():
            print("Your guess must be a lowercase letter!")
        else:
            return guess
            dash_updates()


def dash_updates(word, dashes, guess):
    for i in range(len(word)):
        if word[i] == guess:
            dashes = dashes[:i] + guess + dashes[i + 1:]
            return dashes
        #else:
        #    continue
    dash_updates()

while True:
    guess = get_guess()
    dash_updates(secret_word, dashes, guess)
    dashes = dash_updates(secret_word, dashes, guess)
    if guess in secret_word:
        print("You've guessed a letter correctly! Keep guessing.")
        dash_updates(secret_word, dashes, guess)
        print(dashes)
    else:
        print("That letter isn't in the secret word! Guess again.")