Using kubernetes-4.0.0 python client and exec call as below:-

stream( api.connect_get_namespaced_pod_exec,
name=pod_name, namespace=namespace, command=cmd,
stderr=True, stdin=False, stdout=True, tty=False)

After this call it returns output as a string and not closing connection so If I use it in scale env then I see below error:-
filedescriptor out of range in select

So IMO ws_client.py should be fixed from below code snippet to close connection before return:-
client.run_forever(timeout=_request_timeout)
return WSResponse('%s' % ''.join(client.read_all()))

Please fix this if my observation is correct here.