#!/usr/bin/python3.4
# -*- coding=utf-8 -*-

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

if __name__ == "__main__":
    print(get_ip_address('eno33554944'))