Python 3 Unix Sockets Example - http://www.velvetcache.org/2010/06/14/python-unix-sockets

client.py

# -*- coding: utf-8 -*-
import socket
import os

print("Connecting...")
if os.path.exists("/tmp/python_unix_sockets_example"):
    client = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
    client.connect("/tmp/python_unix_sockets_example")
    print("Ready.")
    print("Ctrl-C to quit.")
    print("Sending 'DONE' shuts down the server and quits.")
    while True:
        try:
            x = input("> ")
            if "" != x:
                print("SEND:", x)
                client.send(x.encode('utf-8'))
                if "DONE" == x:
                    print("Shutting down.")
                    break
        except KeyboardInterrupt as k:
            print("Shutting down.")
            client.close()
            break
else:
    print("Couldn't Connect!")
    print("Done")

server.py

# -*- coding: utf-8 -*-
import socket
import os

if os.path.exists("/tmp/python_unix_sockets_example"):
    os.remove("/tmp/python_unix_sockets_example")

print("Opening socket...")
server = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
server.bind("/tmp/python_unix_sockets_example")

print("Listening...")
while True:
    datagram = server.recv(1024)
    if not datagram:
        break
    else:
        print("-" * 20)
        print(datagram.decode('utf-8'))
        if "DONE" == datagram.decode('utf-8'):
            break
print("-" * 20)
print("Shutting down...")
server.close()
os.remove("/tmp/python_unix_sockets_example")
print("Done")

@ron-vertiv The client from the gist can be modified slightly to work:

# -*- coding: utf-8 -*-
import socket
import os

socket_path = os.path.join(os.environ['XDG_RUNTIME_DIR'], 'echo.socket')

print("Connecting...")
if os.path.exists(socket_path):
    client = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
    client.connect(socket_path)
    print("Ready.")
    print("Ctrl-C to quit.")
    print("Sending 'DONE' shuts down the server and quits.")
    while True:
        try:
            x = input("> ")
            if "" != x:
                print("SEND:", x)
                client.send(x.encode('utf-8'))
                if "DONE" == x:
                    print("Shutting down.")
                    break
                data = client.recv(1024)
                print("RECV:", data)
        except KeyboardInterrupt as k:
            print("Shutting down.")
            client.close()
            break
else:
    print("Couldn't Connect!")
    print("Done")