How can I find the local IP address (i.e. 192.168.x.x or 10.0.x.x) in Python platform independently and using only the standard library?

Solution:

import socket
socket.gethostbyname(socket.gethostname())

This won’t work always (returns 127.0.0.1 on machines having the hostname in /etc/hosts as 127.0.0.1), a paliative would be what gimel shows, use socket.getfqdn() instead. Of course your machine needs a resolvable hostname.