docs: def per_section(it, is_delimiter=lambda x: x.isspace()):
      """
      From http://stackoverflow.com/a/25226944/610569
      """
      ret = []
      for line in it:
          if is_delimiter(line):
              if ret:
                  yield ret  # OR  ''.join(ret)
                  ret = []
          else:
              ret.append(line.rstrip())  # OR  ret.append(line)
      if ret:
          yield ret