Difference between revisions of "Python-examples"

__NOTOC__

= Python: Examples =

== How to write a simple server and client in Python ==

Simple Server/Client communication, communication data is text.

==== Server ====

<pre><nowiki>

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()

</nowiki></pre>

==== Client ====

<pre><nowiki>

import socket

sock = socket.socket(socket.AF_INET, sock.SOCK_STREAM)

sock.connect(('localhost', 5000))

print sock.recv(1024)

sock.send('bye')

</nowiki></pre>

== How to create a subprocess in a thread with Python ==

How to call an external command with `Popen`, a subprocess, inside of a thread.

<pre><nowiki>

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

</nowiki></pre>