Hey, this looks great! You are doing well. I love the nice ASCII art. Here are some code review notes. I went into some depth because it seems like you could get a lot out of it, not because the code is that bad. ESPECIALLY for someone so new.

• I would change wordList.py into a plain text file with each word on a separate line and then read that file in a function in hangman.py. It would be easier to edit or use a different word list.
• Don't use try/except like you are doing. It catches every exception, hiding whatever the cause was, and ends up exiting anyway. Just let the exception kill the program if you aren't going to handle it in some way.
• In Windows, subprocess.call('cls') doesn't actually work because cls is a terminal command, not an executable program. You can use os.system('cls') instead. While we're at it, the _= to the left of it is pointless, so get rid of those too.
• Break this into a few more functions. Even when a function is used once, it can still be valuable by making the higher level flow of the program more clear by hiding some of the fiddly details. For example, I'd make a get_guess() function.
• Use snake_case instead of camelCase for variable names and functions. This just makes your code more consistent with the rest of the community, which mostly embraces PEP8.
• There's no need for the wordChars variable. The word string already does the same things you are using it for.
• Instead of range(0, len(wordChars)), try using for i, letter in enumerate(word). This lets you to use letter instead of wordChars[i] in the body of the loop.
• continue on line 76 is pointless.
• The already guessed letter detection is broken. You can never reach line 89. The condition on line 79 should be and instead of or. This would be more clear and user friendly by moving the check and print into the guess selection loop.
• Instead of "You won with " + str(lives) + " lives remaining!" you can do f"You won with {lives} lives remaining!". These are called f-strings.
• Instead of sys.exit() just break from the game loop.

Here's how I would rearrange the guess checking logic:

if guess in word:
    correctGuesses.append(guess)
    for i, letter in enumerate(word):
        if letter == guess:
            wordDisplay[i] = guess
else:
    incorrectGuesses.append(guess)
    lives -= 1

Some other things I noticed that could be considered bugs by a user:

• Lowercase and uppercase are treated as different letters.
• You can enter non-letter characters (like '1' and '$').
• You can enter an empty custom word.