#!/usr/bin/env python
from __future__ import print_function

# from https://code.activestate.com/recipes/439094-get-the-ip-address-associated-with-a-network-inter/

import socket
import fcntl
import struct
import sys


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


if __name__ == "__main__":
    print(get_ip_address(sys.argv[1]))