Asyncio test

async_test1.py

import asyncio
import os
os.environ['KIVY_EVENTLOOP'] = 'asyncio'
from kivy.lang.builder import Builder
from kivy.app import App
from asyncio import sleep, ensure_future, CancelledError

kv = '''
BoxLayout:
    orientation: 'vertical'
    Button:
        id: btn
        text: 'Press me'
    BoxLayout:
        Label:
            id: label
            text: 'Button is "{}"'.format(btn.state)

    Label:
        id: test
        text: ""
'''


class MyApp(App):
    def build(self):
        return Builder.load_string(kv)
    def on_start(self):
        self.main_task = ensure_future(self.main())
    def on_stop(self):
        self.main_task.cancel()
    async def main(self):
        i = 0
        try:
            while 1:
                await sleep(1)
                i+=1
                self.root.ids.test.text = str(i)
        except CancelledError:
            print("stopping app")
            await sleep(0.2)
            print("stopped")



if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    app = MyApp()
    app_task = ensure_future(app.async_run())
    loop.run_until_complete(app_task)
    print("async_run has finished")
    loop.run_until_complete(app.main_task)
    loop.close()

Thank you for this example. Any idea how one could trigger the background task from a budget widget or other bind event? I can only find examples similar to this one that start the async task at the same time that the whole async app starts.