class MainFrame(wx.Frame):
    """"""

    #----------------------------------------------------------------------
    def __init__(self):
        """Constructor"""
        wx.Frame.__init__(self, None, title="Test")
        panel = wx.Panel(self)

        btn = wx.Button(panel, label="Ask Question")
        btn.Bind(wx.EVT_BUTTON, self.showMessageDlg)

    #----------------------------------------------------------------------
    def showMessageDlg(self, event):
        dial()  #execute of other py file


if __name__ == "__main__":
    app = wx.App(False)
    frame = MainFrame()
    frame.Show()
    app.MainLoop()

"""
        Show a message
        """
        msg = "Do you want to continue?"
        title = "Question!"
        style =  wx.YES_NO|wx.YES_DEFAULT|wx.ICON_QUESTION
        dlg = wx.MessageDialog(parent=None, message=msg, 
                               caption=title, style=style)
        result = dlg.ShowModal()
        if result == wx.ID_YES:
            print "User pressed yes!"
        else:
            print "User pressed no!"
        dlg.Destroy()