http://www.python.org/dev/peps/pep-0008/
ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_
state UP qlen 1000
link/ether 00:12:3f:5e:5c:df brd ff:ff:ff:ff:ff:ff
inet 128.193.97.31/23 brd 128.193.97.255 scope global eth0
inet6 fe80::212:3fff:fe5e:5cdf/64 scope link
valid_lft forever preferred_lft forever