Get local IPv4 address using sockets (cross-platform, std lib)

get_default_address

def get_default_v4_address():
    return get_default_address("8.8.8.8")

def get_default_address(host):
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect((host, 80))
        address = s.getsockname()[0]
        s.close()
    except socket.gaierror, e:
        return None
    return address