Converting wxPython demo code to your code

demo_listbox.py

import wx

#----------------------------------------------------------------------
# BEGIN Demo Code
class FindPrefixListBox(wx.ListBox):
    def __init__(self, parent, id, pos=wx.DefaultPosition, size=wx.DefaultSize,
                 choices=[], style=0, validator=wx.DefaultValidator):
        wx.ListBox.__init__(self, parent, id, pos, size, choices, style, validator)
        self.typedText = ''
        self.log = parent.log
        self.Bind(wx.EVT_KEY_DOWN, self.OnKey)


    def FindPrefix(self, prefix):
        self.log.WriteText('Looking for prefix: %s\n' % prefix)

        if prefix:
            prefix = prefix.lower()
            length = len(prefix)

            # Changed in 2.5 because ListBox.Number() is no longer supported.
            # ListBox.GetCount() is now the appropriate way to go.
            for x in range(self.GetCount()):
                text = self.GetString(x)
                text = text.lower()

                if text[:length] == prefix:
                    self.log.WriteText('Prefix %s is found.\n' % prefix)
                    return x

        self.log.WriteText('Prefix %s is not found.\n' % prefix)
        return -1

    def OnKey(self, evt):
        key = evt.GetKeyCode()

        if key >= 32 and key <= 127:
            self.typedText = self.typedText + chr(key)
            item = self.FindPrefix(self.typedText)

            if item != -1:
                self.SetSelection(item)

        elif key == wx.WXK_BACK:   # backspace removes one character and backs up
            self.typedText = self.typedText[:-1]

            if not self.typedText:
                self.SetSelection(0)
            else:
                item = self.FindPrefix(self.typedText)

                if item != -1:
                    self.SetSelection(item)
        else:
            self.typedText = ''
            evt.Skip()

    def OnKeyDown(self, evt):
        pass


#---------------------------------------------------------------------------

class TestListBox(wx.Panel):
    def __init__(self, parent, log):
        self.log = log
        wx.Panel.__init__(self, parent, -1)

        sampleList = ['zero', 'one', 'two', 'three', 'four', 'five',
                      'six', 'seven', 'eight', 'nine', 'ten', 'eleven',
                      'twelve', 'thirteen', 'fourteen']

        wx.StaticText(self, -1, "This example uses the wx.ListBox control.", (45, 10))
        wx.StaticText(self, -1, "Select one:", (15, 50))
        self.lb1 = wx.ListBox(self, 60, (100, 50), (90, 120), sampleList, wx.LB_SINGLE)
        self.Bind(wx.EVT_LISTBOX, self.EvtListBox, self.lb1)
        self.Bind(wx.EVT_LISTBOX_DCLICK, self.EvtListBoxDClick, self.lb1)
        self.lb1.Bind(wx.EVT_RIGHT_UP, self.EvtRightButton)
        self.lb1.SetSelection(3)
        self.lb1.Append("with data", "This one has data");
        self.lb1.SetClientData(2, "This one has data");


        wx.StaticText(self, -1, "Select many:", (220, 50))
        self.lb2 = wx.ListBox(self, 70, (320, 50), (90, 120), sampleList, wx.LB_EXTENDED)
        self.Bind(wx.EVT_LISTBOX, self.EvtMultiListBox, self.lb2)
        self.lb2.Bind(wx.EVT_RIGHT_UP, self.EvtRightButton)
        self.lb2.SetSelection(0)

        sampleList = sampleList + ['test a', 'test aa', 'test aab',
                                   'test ab', 'test abc', 'test abcc',
                                   'test abcd' ]
        sampleList.sort()
        wx.StaticText(self, -1, "Find Prefix:", (15, 250))
        fp = FindPrefixListBox(self, -1, (100, 250), (90, 120), sampleList, wx.LB_SINGLE)
        fp.SetSelection(0)


    def EvtListBox(self, event):
        self.log.WriteText('EvtListBox: %s, %s, %s\n' %
                           (event.GetString(),
                            event.IsSelection(),
                            event.GetSelection()
                            # event.GetClientData()
                            ))

        lb = event.GetEventObject()
        # data = lb.GetClientData(lb.GetSelection())

        # if data is not None:
            # self.log.WriteText('\tdata: %s\n' % data)

    def EvtListBoxDClick(self, event):
        self.log.WriteText('EvtListBoxDClick: %s\n' % self.lb1.GetSelection())
        self.lb1.Delete(self.lb1.GetSelection())

    def EvtMultiListBox(self, event):
        self.log.WriteText('EvtMultiListBox: %s\n' % str(self.lb2.GetSelections()))

    def EvtRightButton(self, event):
        self.log.WriteText('EvtRightButton: %s\n' % event.GetPosition())

        if event.GetEventObject().GetId() == 70:
            selections = list(self.lb2.GetSelections())
            selections.reverse()

            for index in selections:
                self.lb2.Delete(index)
#----------------------------------------------------------------------
# END Demo Code
#----------------------------------------------------------------------

#----------------------------------------------------------------------
# Start Your own code here           
class FakeLog:
    """
    The log in the demo is a text control, so just create a class
    with an overridden WriteText function
    """
    
    def WriteText(self, string):
        print(string)
   
# Create a frame that can wrap your demo code (works in most cases)

class MyFrame(wx.Frame):
    
    def __init__(self):
        wx.Frame.__init__(self, None, title='Listbox demo', 
                          size=(800,600))
        log = FakeLog()
        panel = TestListBox(self, log=log)
        
        self.Show()
        
if __name__ == '__main__':
    app = wx.App(False)
    frame = MyFrame()
    app.MainLoop()