asyncio timeout bug

[oeway]

It appears that async function cannot take longer than a certain amount of time (e.g. 200ms).

For example, the following code calls a function named test_async which display a message to the output area, sleep for 1 second, then display the same message again:

import asyncio
import IPython
js_code = '''
document.querySelector("#output-area").appendChild(document.createTextNode("hello world!"));
'''

loop = asyncio.get_event_loop()

async def test_async():
  display(IPython.display.Javascript(js_code))
  await asyncio.sleep(1.0)
  display(IPython.display.Javascript(js_code))

loop.create_task(test_async())

# Current output: `hello world!`
# Expected output: `hello world!hello world!`

It should print "hello world!", sleep for 1 second and print again. However, we can only see it printed once.

If we now change the sleep time from 1 to 0.1, it works as expected. After experimenting with different values, I found the breaking point is around 0.2 (200ms).

Could you please look into this issue? @blois

[metrizable]

@oeway Thanks for filing the issue. Since this issue was filed a while ago, there have been a number of upgrades to our ecosystem including an upgrade to ipython==7.34 and Python 3.9.

Although YMMV, the asyncio machinery appears to be working (and with various values passed to asyncio.sleep()) when utilizing asyncio.get_running_loop():

If you are still experiencing the issue, please re-open and provide a minimal reproducible notebook.