I've created a custom bitmap button using the code
PlayButton=wx.Bitmap('play.jpg', wx.BITMAP_TYPE_ANY)
self.PlayButton=wx.BitmapButton(self.bitmap, -1, PlayButton, pos=(190,300))
self.PlayButton.Bind=(wx.EVT_BUTTON, self.playGame)
Just wondering when it comes to defining my function playGame, how I could run an external python file 'game.py' in the same directory when it's clicked