urwid broken example

import urwid

def exit_program():
    raise urwid.ExitMainLoop()

def exit_on_q(key):
    if key in ('q', 'Q'):
        exit_program()



class Menu:
    def __init__(self,title,choices):
        pad = urwid.Padding(self.make(title, choices), left=2, right=2)
        self.main = urwid.Overlay(pad, urwid.SolidFill(u'\N{MEDIUM SHADE}'),
            align='center', width=('relative', 60),
            valign='middle', height=('relative', 60),
            min_width=20, min_height=9)

    def make(self,title,choices):
        body = [urwid.Text(title), urwid.Divider()]
        for c in choices:
            button = urwid.Button(c)
            urwid.connect_signal(button, 'click', self.item_chosen, c)
            body.append(urwid.AttrMap(button, None, focus_map='reversed'))
        return urwid.ListBox(urwid.SimpleFocusListWalker(body))

    def item_chosen(self, button, choice):
        response = urwid.Text([u'You chose ', choice, u'\n'])
        done = urwid.Button(u'Ok')
        urwid.connect_signal(done, 'click', exit_program)
        self.main.original_widget = urwid.Filler(urwid.Pile([response,
            urwid.AttrMap(done, None, focus_map='reversed')]))

class Browser:
    def run(self):

        palette = [
            ('banner', '', '', '', '#ffa', '#60d'),
            ('streak', '', '', '', 'g50', '#60a'),
            ('inside', '', '', '', 'g38', '#808'),
            ('outside', '', '', '', 'g27', '#a06'),
            ('bg', '', '', '', 'g7', '#d06'),]

        placeholder = urwid.SolidFill()
        loop = urwid.MainLoop(placeholder, palette, unhandled_input=exit_on_q)
        loop.screen.set_terminal_properties(colors=256)
        loop.widget = urwid.AttrMap(placeholder, 'bg')
        loop.widget.original_widget = urwid.Filler(urwid.Pile([]),'top')

        div = urwid.Divider()
        outside = urwid.AttrMap(div, 'outside')
        inside = urwid.AttrMap(div, 'inside')

        txt = (
            r".__           .__  .__                               .__       .___",
            r"|  |__   ____ |  | |  |   ____   __  _  _____________|  |    __| _/",
            r"|  |  \_/ __ \|  | |  |  /  _ \  \ \/ \/ /  _ \_  __ \  |   / __ | ",
            r"|   Y  \  ___/|  |_|  |_(  <_> )  \     (  <_> )  | \/  |__/ /_/ | ",
            r"|___|  /\___  >____/____/\____/    \/\_/ \____/|__|  |____/\____ | ",
            r"     \/     \/                                                  \/ "
            )
        get_streak = lambda line : urwid.AttrMap(urwid.Text(('banner', line), align='center'),'streak')
        streaks = map(get_streak,txt)

        choices = ('A','B','C')

        main_menu = urwid.BoxAdapter(urwid.AttrMap(Menu('Medium',choices).main,'streak'),20)

        pile = loop.widget.base_widget
        widgets = [outside, inside, *streaks, inside, outside,outside,outside,main_menu]
        for item in widgets:
            pile.contents.append((item, pile.options()))
        pile.focus_position = widgets.index(main_menu)
        loop.run()

browser = Browser()
browser.run()