class Panel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)
        wx.Button(self, label = 'Hello!')

class AppFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title = 'Hello, world!')
        self.notebook = wx.Notebook(self, style = wx.NB_MULTILINE | wx.NB_NOPAGETHEME)
        
        self.notebook.AddPage(Panel(self.notebook), 'Hello')

        self.Show()