def Start(self, millisecs=None):
        """ Emulate wx.Timer.
        """
        self._is_active = True

        if millisecs is not None:
            self.start()
        else:
            self.start(millisecs)
dataset/ETHPy150Open enthought/pyface/pyface/ui/qt4/timer/timer.py/Timer.Start/operator `is` -> `is not`