code: def get_attrib_tokens(self, a="words"):
          
          return self.sentence.__getattribute__(a)[
              self.get_word_start_index() : self.get_word_end_index() + 1
          ]
docs: Get the tokens of sentence attribute *a*.
  
          Intuitively, like calling::
  
              span.a
  
  
          :param a: The attribute to get tokens for.
          :type a: str
          :return: The tokens of sentence attribute defined by *a* for the span.
          :rtype: list