class_docstr: The next version of our playlist generator that adds a 'hint' parameter to
  choose a bonus movie closest to the 'hint'.
  
  The flow performs the following steps:
  
  1) Load the genre-specific statistics from the MovieStatsFlow.
  2) In parallel branches:
     - A) Build a playlist from the top films in the requested genre.
     - B) Choose a bonus movie that has the closest string edit distance to
       the user supplied hint.
  3) Join the two to create a movie playlist and display it.
docstr: Join our parallel branches and merge results.
code: def join(self, inputs):
      """
      Join our parallel branches and merge results.
  
      """
      self.playlist = inputs.genre_movies.movies
      self.bonus = inputs.bonus_movie.bonus
  
      self.next(self.end)
  
file_path: metaflow/metaflow/tutorials/04-playlist-plus/playlist.py
imports: from metaflow import FlowSpec, step, Parameter, conda, conda_base
label_desc: Use image node_id 4 for calling the PlayListFlow obj's underlying member method code with example usage: obj.join(inputs) without return types