[Python] How to hide/reveal letters in python game?

I'm new to coding and am currently trying to make a simplified game of Hangman using Python 3. For the most part, I have it down, except for the most important part, how to hide the letters of the random word, and then how to reveal them once guessed. Mainly, I just need a quick answer. Any help would be greatly appreciated. Here's my code so far (sorry if it's long, like I said, I relatively new at this, and thanks again!):

import random

#list of words for game
hangmanWords = ("Halloween","Hockey","Minnesota","Vikings","Twins","Timberwolves","Wild","Playstation","Achievement","Minecraft","Metallica","Portal","Xbox","Guitar")

#randomizes the word chosen for game
index = random.randint(0,len(hangmanWords)-1)

#assigns radomized word to variable
randomWord = hangmanWords[index]


'''
menu function, provides user with choices for game, user chooses via imput
'''
def menu():
print("""
Welcome to Hangman!

Select a difficulty:
1. Easy (9 Misses)
2. Medium (7 Misses)
3. Advanced (5 Misses)

4. Exit Game
""")
selection = int(input("What difficulty do you pick (1-4)?: "))
return selection

'''
the function for easy mode, prints the word chosen by randomizer
asks the player to enter a letter that they guess is in the word
player gets 9 guesses to figure out word, correct guesses don't
count, returns player to main menu when they lose
'''
def easyMode():
wrongGuesses = 0
listOfGuesses = []
print(randomWord)
while(wrongGuesses != 9):
x = input("Enter a letter: ")
if x.lower() in randomWord.lower():
print(x,"is in the word!")
listOfGuesses.append(x)
print("Letters guessed so far: ",listOfGuesses)
print()
else:
print(x,"is not in the word.")
wrongGuesses += 1
print(wrongGuesses, "wrong guesses.")
listOfGuesses.append(x)
print("Letters guessed so far: ",listOfGuesses)
print()

print("You lost the game!")
return x

'''
the function for medium mode, prints the word chosen by randomizer
asks the player to enter a letter that they guess is in the word
player gets 7 guesses to figure out word, correct guesses don't
count, returns player to main menu when they lose
'''
def medium():
wrongGuesses = 0
listOfGuesses = []
print(randomWord)
while(wrongGuesses != 7):
x = input("Enter a letter: ")
if x.lower() in randomWord.lower():
print(x,"is in the word!")
listOfGuesses.append(x)
print("Letters guessed so far: ",listOfGuesses)
print()
else:
print(x,"is not in the word.")
wrongGuesses += 1
print(wrongGuesses, "wrong guesses.")
listOfGuesses.append(x)
print("Letters guessed so far: ",listOfGuesses)
print()

print("You lost the game!")
return x

'''
the function for advanced mode, prints the word chosen by randomizer
asks the player to enter a letter that they guess is in the word
player gets 5 guesses to figure out word, correct guesses don't
count, returns player to main menu when they lose
'''
def advanced():
wrongGuesses = 0
listOfGuesses = []
print(randomWord)
while(wrongGuesses != 5):
x = input("Enter a letter: ")
if x.lower() in randomWord.lower():
print(x,"is in the word!")
listOfGuesses.append(x)
print("Letters guessed so far: ",listOfGuesses)
print()
else:
print(x,"is not in the word.")
wrongGuesses += 1
print(wrongGuesses, "wrong guesses.")
listOfGuesses.append(x)
print("Letters guessed so far: ",listOfGuesses)
print()

print("You lost the game!")
return x

'''
main function, deals with what happens depending on
what the player selected on the menu
'''
def main():
select = menu()
while(select != 4):
if(select == 1):
easyMode()
elif(select == 2):
medium()
elif(select == 3):
advanced()

select = menu()

print("You don't want to play today? :'(")

main()

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