import wx
app = wx.App()
frm = wx.Frame(None, title="Hello World")
frm.Show()
app.MainLoop()

# simple_note.py

import random
import wx


class TabPanel(wx.Panel):

    def __init__(self, parent, name):
    """"""
    super().__init__(parent=parent)
    self.name = name

    colors = ["red", "blue", "gray", "yellow", "green"]
    self.SetBackgroundColour(random.choice(colors))

    btn = wx.Button(self, label="Press Me")
    sizer = wx.BoxSizer(wx.VERTICAL)
    sizer.Add(btn, 0, wx.ALL, 10)
    self.SetSizer(sizer)


class DemoFrame(wx.Frame):
    """
    Frame that holds all other widgets
    """


    def __init__(self):
    """Constructor"""
    super().__init__(None, wx.ID_ANY,
                     "Notebook Tutorial",
                     size=(600,400)
                     )
    panel = wx.Panel(self)

    self.notebook = wx.Notebook(panel)
    self.notebook.Bind(wx.EVT_NOTEBOOK_PAGE_CHANGED, self.on_tab_change)
    tabOne = TabPanel(self.notebook, name='Tab 1')
    self.notebook.AddPage(tabOne, "Tab 1")

    tabTwo = TabPanel(self.notebook, name='Tab 2')
    self.notebook.AddPage(tabTwo, "Tab 2")

    sizer = wx.BoxSizer(wx.VERTICAL)
    sizer.Add(self.notebook, 1, wx.ALL|wx.EXPAND, 5)
    panel.SetSizer(sizer)
    self.Layout()

    self.Show()

    def on_tab_change(self, event):
    # Works on Windows and Linux, but not Mac
    current_page = self.notebook.GetCurrentPage()
    print(current_page.name)
    event.Skip()


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