def undefine(self):
if lib.EnvUndefmethod(self._env, self._gnc, self._idx) != <NUM_LIT:1>:<EOL><INDENT>raise CLIPSError(self._env)<EOL><DEDENT>self._env = None<EOL>
Undefine the Method.

        Python equivalent of the CLIPS undefmethod command.

        The object becomes unusable after this method has been called.