get ip address

ip_addr.py

import socket
import fcntl
import struct

def get_ip_address(ifname):
   """
    >>> get_ip_address('lo')
    '127.0.0.1'

    >>> get_ip_address('eth0')
    '38.113.228.130'
    """
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    return socket.inet_ntoa(fcntl.ioctl(
        s.fileno(),
        0x8915,  # SIOCGIFADDR
        struct.pack('256s', ifname[:15])
    )[20:24])