urwid_trio.py

import trio
import urwid


def exit_on_q(key):
    if key in ('q', 'Q'):
        raise urwid.ExitMainLoop()


class QuestionBox(urwid.Filler):
    def keypress(self, size, key):
        if key != 'enter':
            return super(QuestionBox, self).keypress(size, key)
        self.original_widget = urwid.Text(f"Starting task...")
        trio_event_loop._nursery.start_soon(job, self.original_widget, int(edit.edit_text))


edit = urwid.Edit(u"How many steps?\n")
fill = QuestionBox(edit)


async def job(text: urwid.Text, iterations: int):
    """An async job"""
    await trio.sleep(1)
    for x in range(1, iterations + 1):
        text.set_text(f'Step {x}/{iterations} done')
        await trio.sleep(0.5)
    text.set_text(f'FINALIZED! Press Q to exit.')

trio_event_loop = urwid.TrioEventLoop()
loop = urwid.MainLoop(fill, unhandled_input=exit_on_q, event_loop=trio_event_loop)
loop.run()