Do not run wx app more (python)

singleton_wx.py

class appMain(wx.App):
    """Application class
    """
    def OnInit(self):
        """ Construction event handler
        Called by wx when application launch.
        Check whether the app already running,
        if it has been running, abort launching.

        :rtype: boolean
        :return: whether construction process has succeed.
        """
        self.name = APP.NAME
        self.version = APP.VERSION
        self.instance = wx.SingleInstanceChecker(self.name)

        # -- Check another instance already running?
        if self.instance.IsAnotherRunning():
            wx_utils.show_message(None, TEXT.ALREADY_RUNNING, TEXT.TITLE.NOTICE)
            return False    # wx would be abort.
        else:
            print TEXT.STARTING
            #self._launch_data_viewer()
            self._launch_stat_frame()   # stat debug
            return True     # wx continues.