old_contents: __author__ = 'caoliang2598'
  
  
  class Movie():
      def __init__(self, title, story_line, poster_image_url,
                   trailer_youtube_url):
          self.title = title
          self.poster_image_url = poster_image_url
          self.trailer_youtube_url = trailer_youtube_url
          self.story_line = story_line
new_contents: __author__ = 'caoliang2598'
  
  # A class which represent Movie.
  # it includes movie's title, poster image url, youtube trailer url, story line
  
  
  class Movie():
      def __init__(self, title, story_line, poster_image_url,
                   trailer_youtube_url):
          self.title = title
          self.poster_image_url = poster_image_url
          self.trailer_youtube_url = trailer_youtube_url
          self.story_line = story_line
subject: fix code style comments