In testing AsyncSSH against Python 3.8, I noticed a large number of the following errors, even though I was properly closing streams before the objects holding them were garbage-collected.    An open stream object is being garbage collected; call "stream.close()" explicitly.After some investigation, the problem appears to be that closing a stream is not good enough to prevent the error. The check in asyncio doesn't properly handle the case where the stream is closing, but has not fully closed. Here's a simple test program that demonstrates this:import asyncioasync def tcp_client():    reader, writer = await asyncio.open_connection('127.0.0.1', 22)    writer.close()asyncio.run(tcp_client())It's possible to avoid this message by awaiting on writer.wait_closed(), but wait_closed() doesn't exist until Python 3.7, making it very difficult to write portable code and still avoid this message.

I think the following change might address this problem:****************** 233,239 ****        def _on_reader_gc(self, wr):          transport = self._transport!         if transport is not None:              # connection_made was called              context = {                  'message': ('An open stream object is being garbage '--- 233,239 ----        def _on_reader_gc(self, wr):          transport = self._transport!         if transport is not None and not transport.is_closing():              # connection_made was called              context = {                  'message': ('An open stream object is being garbage '

Sorry, I should have said that the change below was in the file asyncio/streams.py.

Yes, I've experienced this bug. We need to fix this in 3.8.1.

New changeset7ddcd0caa4c2e6b43265df144f59c5aa508a94f2 by Andrew Svetlov in branch 'master':bpo-38529: Fix asyncio stream warning (GH-17474)https://github.com/python/cpython/commit/7ddcd0caa4c2e6b43265df144f59c5aa508a94f2

New changeset7fde4f446a3dcfed780a38fbfcd7c0b4d9d73b93 by Miss Islington (bot) in branch '3.8':bpo-38529: Fix asyncio stream warning (GH-17474)https://github.com/python/cpython/commit/7fde4f446a3dcfed780a38fbfcd7c0b4d9d73b93