wx.TextCtrl に EVT_KILK_FOCUS をセットするサンプル

wx.TextCtrl-EVT_KILK_FOCUS.py

import wx

class Frame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, size=wx.Size(300, 200))
        panel = wx.Panel(self, wx.ID_ANY)
        self.text = "ABC..."
        textCtrl = wx.TextCtrl(panel, wx.ID_ANY, self.text,
                               size=wx.Size(90, -1), style=wx.TE_PROCESS_ENTER)
        for evt in [wx.EVT_KILL_FOCUS, wx.EVT_TEXT_ENTER]:
            # self.Bind(evt, self.OnText, textCtrl)  # こっちは NG
            textCtrl.Bind(evt, self.OnText)  # こっちは OK
    def OnText(self, event):
        t = event.GetEventObject().GetValue()
        if self.text !=  t:
            mesg ="{} => {}".format(self.text, t)
            print(mesg)
            self.text = t  # MessageBox で再び KILL_FOCUS 動くのでここで代入
            wx.MessageBox(mesg)

app = wx.App()
frame = Frame()
frame.Show()
app.MainLoop()