def revocable(self):
        """
        ``False`` if this signature is marked as being not revocable. Otherwise, ``True``.
        """
        if 'Revocable' in self._signature.subpackets:
            return bool(next(iter(self._signature.subpackets['Revocable'])))
        return True
``False`` if this signature is marked as being not revocable. Otherwise, ``True``.