如何从 wxlistbox 中获取选定的值

import wx

class MyFrame(wx.Frame):
    def __init__(self, parent, title):
        super(MyFrame, self).__init__(parent, title=title, size=(200, 100))

        self.list_box = wx.ListBox(self, choices=['选项1', '选项2', '选项3'])
        self.button = wx.Button(self, label='获取选定值')

        self.Bind(wx.EVT_BUTTON, self.on_button_click, self.button)

    def on_button_click(self, event):
        selection = self.list_box.GetSelection()
        if selection != wx.NOT_FOUND:
            print(f'选定的值为：{self.list_box.GetString(selection)}')
        else:
            print('没有选定任何值')

if __name__ == '__main__':
    app = wx.App()
    frame = MyFrame(None, title='获取选定值')
    frame.Show(True)
    app.MainLoop()