Error while running the server example from the docs

I’m trying to run this example which is in the docs here

import eventlet
import socketio

sio = socketio.Server()
app = socketio.WSGIApp(sio, static_files={
    '/': {'content_type': 'text/html', 'filename': 'index.html'}
})

@sio.event
def connect(sid, environ):
    print('connect ', sid)

@sio.event
def my_message(sid, data):
    print('message ', data)

@sio.event
def disconnect(sid):
    print('disconnect ', sid)

if __name__ == '__main__':
    eventlet.wsgi.server(eventlet.listen(('', 5000)), app)

But as soon as I execute it I get this error

(15262) wsgi starting up on http://0.0.0.0:5000
(15262) wsgi exited, is_accepting=True
Traceback (most recent call last):
  File "the_path_in_my_pc/__init__.py", line 70, in <module>
    eventlet.wsgi.server(eventlet.listen(('', 5000)), app)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/eventlet/wsgi.py", line 990, in server
    client_socket, client_addr = sock.accept()
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/eventlet/greenio/base.py", line 230, in accept
    self._trampoline(fd, read=True, timeout=self.gettimeout(), timeout_exc=_timeout_exc)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/eventlet/greenio/base.py", line 208, in _trampoline
    return trampoline(fd, read=read, write=write, timeout=timeout,
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/eventlet/hubs/__init__.py", line 155, in trampoline
    listener = hub.add(hub.READ, fileno, current.switch, current.throw, mark_as_closed)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/eventlet/hubs/kqueue.py", line 53, in add
    self._control([event], 0, 0)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/eventlet/hubs/kqueue.py", line 39, in _control
    return self.kqueue.control(events, max_events, timeout)
TypeError: changelist must be an iterable of select.kevent objects

What may be the cause?

[leadscloud]

@miguelgrinberg only at macos with python3.9

[Pizzaface]

I realize this issue is stale, however since this is an edge issue - and this is the first result on Google while researching, here’s how I was able to work around the issue.

Only applicable for 3.9.x from what I’ve seen

1. Install uvloop (pip install uvloop)
2. import uvloop at the beginning of your code.
3. Before invoking the event loop - run uvloop.install()

This should stop it from giving this issue.

Hope this helps!