wxpython capture keyboard events in a wx.Frame

Question

I'm trying to capture keyboard events that happen inside a wx.Frame, and I would expect the following code to capture those events. However, the handler OnKeyDown is never called when I run the code:

import logging as log
import wx

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

        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
        self.Bind(wx.EVT_KEY_UP, self.OnKeyDown)
        self.Bind(wx.EVT_CHAR, self.OnKeyDown)
        self.SetFocus()
        self.Show(True)

    def OnKeyDown(self, event=None):
        log.debug("OnKeyDown event %s" % (event))

if __name__ == "__main__":
    app = wx.App(False)
    gui = MainWindow(None, "test")
    app.MainLoop()

If anyone knows how to do this, I would appreciate some help.

Answer 1

I figured out that I can add a panel to the frame, and a panel is much more receptive of keyboard events.

import wx

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

        self.panel = wx.Panel(self, wx.ID_ANY)
        self.panel.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
        self.panel.Bind(wx.EVT_KEY_UP, self.OnKeyDown)
        self.panel.Bind(wx.EVT_CHAR, self.OnKeyDown)
        self.panel.SetFocus()
        self.Show(True)

    def OnKeyDown(self, event=None):
        print "Event!"

if __name__ == "__main__":
    app = wx.App(False)
    gui = MainWindow(None, "test")
    app.MainLoop()