List Plex Movie Duplicates

# run 'pip3 install plexapi' first
# run the code below with python 3.x

from plexapi.myplex import MyPlexAccount
account = MyPlexAccount('your_username', 'your_password')
plex = account.resource('your_server').connect()

movies = plex.library.section('your_movie_library')
for movie in movies.search(duplicate=True):
    print(movie.title)

Note: In addition to actual duplicates (ex. movie.mkv, movie_copy.mkv), versions (ex. Directors Cut, Theatrical Cut, etc) for the same movie are also considered duplicates.