I have error 3 try to open any file in my application!

wxPython Users
1

I'm trying to open files the issue is that the path or root directory
is not found
here some of code

if self.dlg.ShowModal() == wx.ID_OK:
            self.filename = self.dlg.GetFilename()
            self.dirname = self.dlg.GetDirectory()

            path = open(os.path.join(self.dirname, self.filename))
            self.file = editor.EditorPanel(self.mainntbk, -1)
            self.file.LoadFile(path.read())
            self.mainntbk.AddPage(self.file, ""+self.filename)
        self.dlg.Destroy()