HtmlListBox wxPython 4.11

# Modified version of https://stackoverflow.com/a/6556312/402645 that runs on
# the latest wxPython 4.1.1

import wx
import wx.html


class PhoneNumbers(wx.html.HtmlListBox):
    def __init__(self, parent):
        wx.html.HtmlListBox.__init__(self, parent)
        self.data = [
            ("Foo", "3452-453"),
            ("Bar", "5672-346"),
        ]
        self.SetItemCount(len(self.data))

    def OnGetItem(self, n):
        return "<b>%s</b><br>%s" % self.data[n]

    def add_number(self, name, number):
        self.data.append((name, number))
        self.SetItemCount(len(self.data))
        self.Refresh()


class Frame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, size=(200, 400))

        self.numbers = PhoneNumbers(self)
        self.contact_name = wx.TextCtrl(self)
        self.contact_number = wx.TextCtrl(self)
        self.add_btn = wx.Button(self, label="Add contact")

        self.Sizer = wx.BoxSizer(wx.VERTICAL)
        self.Sizer.Add(self.numbers, 1, wx.EXPAND)
        self.Sizer.Add(wx.SearchCtrl(self), 0, wx.EXPAND)
        self.Sizer.Add(wx.StaticText(self, label="Name"), 0, wx.TOP, 10)
        self.Sizer.Add(self.contact_name)
        self.Sizer.Add(wx.StaticText(self, label="Number"), 0, wx.TOP, 5)
        self.Sizer.Add(self.contact_number)
        self.Sizer.Add(self.add_btn, 0, wx.ALL, 10)

        self.numbers.Bind(wx.EVT_LISTBOX, self.OnSelectNumber)
        self.add_btn.Bind(wx.EVT_BUTTON, self.OnAddNumber)

    def OnSelectNumber(self, event):
        name, number = self.numbers.data[event.Selection]
        self.contact_name.Value = name
        self.contact_number.Value = number

    def OnAddNumber(self, event):
        self.numbers.add_number(
            self.contact_name.Value,
            self.contact_number.Value
        )


app = wx.App()
app.TopWindow = f = Frame()
f.Show()
app.MainLoop()