text: from vaderSentiment.vaderSentiment import SentimentIntensityAnalyzer
  
  ANALYSER = SentimentIntensityAnalyzer()
  
  def _get_polarity_from_vader_score(vader_score):
      compound_score = vader_score.get("compound")
      if compound_score > 0.05:
          return "positive"
      elif compound_score < -0.05:
          return "negative"
      return "neutral"
  
  def add_scores_and_polarities_to(play_store_review):
      play_store_review["vader_scores"] = play_store_review.content.apply(ANALYSER.polarity_scores)
      play_store_review["polarity_value"] = play_store_review.vader_scores.apply(_get_polarity_from_vader_score)
  