code: def get_bio(tweet):
      
  
      if is_original_format(tweet):
          bio_or_none = tweet["user"].get("description", "")
      else:
          bio_or_none = tweet["actor"].get("summary", "")
      if bio_or_none is None:
          return ""
      else:
          return bio_or_none
docs: Get the bio text of the user who posted the Tweet
  
      Args:
          tweet (Tweet): A Tweet object (or a dictionary)
  
      Returns:
          str: the bio text of the user who posted the Tweet
          In a payload the abscence of a bio seems to be represented by an
          empty string or a None, this getter always returns a string (so, empty
          string if no bio is available).
  
      Example:
          >>> from tweet_parser.getter_methods.tweet_user import get_bio
          >>> original_format_dict = {
          ...             "created_at": "Wed May 24 20:17:19 +0000 2017",
          ...             "user":
          ...              {"description": "Niche millenial content aggregator"}
          ...            }
          >>> get_bio(original_format_dict)
          'Niche millenial content aggregator'
  
          >>> activity_streams_format_dict = {
          ...             "postedTime": "2017-05-24T20:17:19.000Z",
          ...             "actor":
          ...              {"summary": "Niche millenial content aggregator"}
          ...             }
          >>> get_bio(activity_streams_format_dict)
          'Niche millenial content aggregator'