urwiddemo.py

import datetime

import urwid

top = urwid.Filler(urwid.Text("this is\nfour lines\nof text\n."))
bottom_walker = urwid.SimpleListWalker([])
bottom = urwid.ListBox(bottom_walker)
main = urwid.Pile([
    (4, top),
    bottom,
], focus_item=bottom)


def add_to_bottom(loop, data):
    bottom_walker.append(urwid.Text(
        "wow some new text, amazing @ {}"
        .format(datetime.datetime.utcnow())
    ))
    bottom_walker.set_focus(len(bottom_walker) - 1)
    loop.set_alarm_in(1, add_to_bottom)


loop = urwid.MainLoop(main)
add_to_bottom(loop, None)
loop.run()