#!/usr/bin/env python
# FILE: server.py
import socket
HOST = ''
PORT = 3000
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
 s.bind((HOST, PORT))
 s.listen(1)
 conn, addr = s.accept()
 with conn:
 print('Connected by', addr)
 while True:
 data = conn.recv(1024)
 if data == b'\n':
 break
 conn.sendall(data)

then

python server.py

and

netcat localhost 3000

to test against

These pages describe my interpretation of a subversion setup.