"""Some useful functions."""

import socket


def get_ip():
    """Return the primary, routable, IP address.
       From https://stackoverflow.com/a/28950776
    """
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
        s.connect(('10.255.255.255', 1))
        IP = s.getsockname()[0]
    except:
        IP = '127.0.0.1'
    finally:
        s.close()
    return IP