Asyncio NotImplemented Error with Python 3.8 and Windows

As explained in tornadoweb/tornado#2608, the default behavior in Python 3.8 has changed and we get an error on Windows only:

>livereload site
[I 191026 22:40:22 server:296] Serving on http://127.0.0.1:35729
Traceback (most recent call last):
  File "c:\program files\python38\lib\runpy.py", line 192, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\program files\python38\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Program Files\Python38\Scripts\livereload.exe\__main__.py", line 7, in <module>
  File "c:\program files\python38\lib\site-packages\livereload\cli.py", line 60, in main
    server.serve(host=args.host, port=args.port, root=args.directory,
  File "c:\program files\python38\lib\site-packages\livereload\server.py", line 298, in serve
    self.application(
  File "c:\program files\python38\lib\site-packages\livereload\server.py", line 253, in application
    app.listen(port, address=host)
  File "c:\program files\python38\lib\site-packages\tornado\web.py", line 2112, in listen
    server.listen(port, address)
  File "c:\program files\python38\lib\site-packages\tornado\tcpserver.py", line 152, in listen
    self.add_sockets(sockets)
  File "c:\program files\python38\lib\site-packages\tornado\tcpserver.py", line 165, in add_sockets
    self._handlers[sock.fileno()] = add_accept_handler(
  File "c:\program files\python38\lib\site-packages\tornado\netutil.py", line 279, in add_accept_handler
    io_loop.add_handler(sock, accept_handler, IOLoop.READ)
  File "c:\program files\python38\lib\site-packages\tornado\platform\asyncio.py", line 99, in add_handler
    self.asyncio_loop.add_reader(fd, self._handle_events, fd, IOLoop.READ)
  File "c:\program files\python38\lib\asyncio\events.py", line 501, in add_reader
    raise NotImplementedError
NotImplementedError

It appears that Tornado is not going to override the default themselves, but instead expect applications using Tornado to override the default. In other words, Tornado expects Python-Livereload to set this itself.

Of course users of Python-Livereload who are calling the lib programmatically through Python code can just do the override themselves. However, anyone using the command line tool will need Python-Livereload to address this for them. Therefore, my question is: will Python-Livereload be addressing this for all users or only the command line tool?

[bmcculley]

Closing this, new release on pypi fixes this issue.

[waylan]

Could we get a response on this? At a minimum, what is the plan? As the developer of a third party tool which calls Python-Livereload through the Python API, should I be addressing this myself, or will you be addressing it?