Checking support for network connections from Python client to IPv6 server

[Chris Angelico]

On Sun, Jun 2, 2019 at 5:17 PM Markus Elfring <Markus.Elfring at web.de> wrote:
>
> >> How would like to explain the error message “socket.gaierror: [Errno -9]
> >> Address family for hostname not supported” on my Linux test system then?
> >
> > Can you supply a tiny standalone piece of code demonstrating this error please?
>
> The following script part would be relevant.
>
> …
> def send_data(x):
>    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as so:
>        global args
>        so.connect((args.server_id, args.server_port))
> …
>
>
> If the address family “AF_INET6” was passed instead, the identification “::1”
> can work also as a command parameter.
> The data transmission seems to succeed by my script “socket-send_json_data2.py” then.
>

May I recommend using this function instead? It'll be easier to handle
both IPv4 and IPv6:

https://docs.python.org/3/library/socket.html#socket.create_connection

ChrisA