def label(self):
        """
        Get or set any <label> element associated with this element.
        """
        id = self.get('id')
        if not id:
            return None
        result = _label_xpath(self, id=id)
        if not result:
            return None
        else:
            return result[0]

        Get or set any <label> element associated with this element.
        
stackoverflow/venv/lib/python3.6/site-packages/lxml/html/__init__.py