def for_element(self):
        """
        Get/set the element this label points to.  Return None if it
        can't be found.
        """
        id = self.get('for')
        if not id:
            return None
        return self.body.get_element_by_id(id)

        Get/set the element this label points to.  Return None if it
        can't be found.
        
stackoverflow/venv/lib/python3.6/site-packages/lxml/html/__init__.py