Python Simple Socket Server

client.py

import socket

s = socket.socket()
host = "0.0.0.0" # REPLACE with IP of server
port = 12345
s.connect((host, port))
s.send("foo")
s.close()

server.py

import socket

s = socket.socket()
host = ""
port = 12345
s.bind((host, port))
s.listen(5)

while True:
    try:
        clientsock, addr = s.accept()
    except OSError:
        continue
    message = clientsock.recv(20)

    #the code you want to run
    print("doing %s" % message)

    clientsock.close()