RuntimeError when using along with any async code

[DNikolaevAtRocket]

Description

tnz fails with RuntimeError: This event loop is already running as soon as there's an event loop used by any other code.

How to reproduce

Just try to call Tnz.wait in any combination with async code. See the simple example below.

from tnz.tnz import Tnz
import asyncio


async def main():
    tnz = Tnz()
    tnz.connect('<HOSTNAME>', 23)
    tnz.wait()
    print(tnz.scrstr(rstrip=True))
    tnz.close()

asyncio.run(main())

[najohnsn]

Under the covers, these functions manage an async event loop. Functions that are suitable for use in an async function is a work in progress. I'm glad to hear there is interest.

[najohnsn]

With #71, your example program can be changed to what follows to use with asyncio:

from tnz.tnz import Tnz
import asyncio


async def main():
    event = asyncio.Event()
    tnz = Tnz()
    tnz.connect("s390vm", event=event)
    await event.wait()
    event.clear()  # set up to re-use event
    print(tnz.scrstr(rstrip=True))
    tnz.close()

asyncio.run(main())

Note that tnz will call event.set() for every update from the server. To re-use it, use event.clear() after the await as noted above.

Note that Tnz.wait() cannot be used for this use case. And Tnz provides low-level APIs while Ati provides high-level APIs. But there are not yet any high-level APIs that can be used in this manner (in an asyncio event loop).