Get local IP in Python

This is a cool code snippet I have used on several occacions for Python projects that need to figure out what the IP of the device they are running on is.
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(
        0x8915, # SIOCGIFADDR
        struct.pack('256s', ifname[:15])

ip_address = get_ip_address('wlan0')