View source for Python snippets

__NOTOC__
=== How to write a simple server and client in Python ===
Simple Server/Client communication, communication data is text.

==== Server ====
 import SocketServer
 
 class EchoRequestHandler(SocketServer.BaseRequestHandler):
    def setup(self):
        print self.client_address, 'connected!'
        self.request.send('hi ' + str(self.client_address) + '\n')
 
    def handle(self):
        while 1:
            data = self.request.recv(1024)
            self.request.send(data)
            if data.strip() == 'bye':
                return
 
    def finish(self):
        print self.client_address, 'disconnected!'
        self.request.send('bye ' + str(self.client_address) + '\n')
 
 # Server host is a tuple ('host', port)
 server = SocketServer.ThreadingTCPServer(('localhost', 5000), EchoRequestHandler)
 server.serve_forever()

==== Client ====
 import socket
 
 sock = socket.socket(socket.AF_INET, sock.SOCK_STREAM)
 sock.connect(('localhost', 5000))
 print sock.recv(1024)
 sock.send('bye')

=== How to create a subprocess in a thread with Python ===
How to call an external command with <code>Popen</code>, a subprocess, inside of a thread.
 import threading
 import subprocess
 
 class MyClass(threading.Thread):
    def __init__(self):
        self.stdout = None
        self.stderr = None
        threading.Thread.__init__(self)
 
    def run(self):
        p = subprocess.Popen('rsync -av /etc/passwd /tmp'.split(),
                             shell=False,
                             stdout=subprocess.PIPE,
                             stderr=subprocess.PIPE)
 
        self.stdout, self.stderr = p.communicate()
 
 myclass = MyClass()
 myclass.start()
 myclass.join()
 print myclass.stdout