code: def undefine(self):
          
          if lib.EnvUndefmethod(self._env, self._gnc, self._idx) != 1:
              raise CLIPSError(self._env)
  
          self._env = None
docs: Undefine the Method.
  
          Python equivalent of the CLIPS undefmethod command.
  
          The object becomes unusable after this method has been called.