wxPython - SetToolShortHelp() function in wx.ToolBar

import wx

class Example(wx.Frame):

    def __init__(self, *args, **kwargs):
        super(Example, self).__init__(*args, **kwargs)
        self.InitUI()

    def InitUI(self):
        self.locale = wx.Locale(wx.LANGUAGE_ENGLISH)
        self.toolbar = self.CreateToolBar()

        td = self.toolbar.AddTool(1, 'right', wx.Bitmap('right.png'))
        te = self.toolbar.AddTool(2, 'wrong', wx.Bitmap('wrong.png'))

        # set separation of toolbar to 20
        self.toolbar.SetToolShortHelp(toolId = 1, helpString ="new short help")

        self.toolbar.Realize()
        self.Bind(wx.EVT_TOOL, self.OnOne, td)

        self.SetSize((350, 250))
        self.SetTitle('Undo redo')
        self.Centre()

    def OnOne(self, e):
        print(self.toolbar.GetToolSeparation())
        # Realize() called to finalize new added tools
        self.toolbar.Realize()

    def OnQuit(self, e):
        self.Close()


def main():

    app = wx.App()
    ex = Example(None)
    ex.Show()
    app.MainLoop()


if __name__ == '__main__':
    main()