def value(self):
        """
        Get/set the value, which checks the radio with that value (and
        unchecks any other value).
        """
        for el in self:
            if 'checked' in el.attrib:
                return el.get('value')
        return None

        Get/set the value, which checks the radio with that value (and
        unchecks any other value).
        
stackoverflow/venv/lib/python3.6/site-packages/lxml/html/__init__.py