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    python的twisted比較有意思，既能够做server方面的编程，也能够做client方面的编程。关于这方面的编程。最简单的样例就是echo。

    client 代码例如以下，

#!/usr/bin/python

from twisted.internet.protocol import Protocol, ClientFactory
from sys import stdout
from twisted.internet import reactor

class Echo(Protocol):
	def dataReceived(self, data):
		stdout.write(data)
 
class EchoClientFactory(ClientFactory):
	def startedConnecting(self, connector):
		print ‘Started to connect.‘
   
	def buildProtocol(self, addr):
		print ‘Connected.‘
		return Echo()
   
	def clientConnectionLost(self, connector, reason):
		print ‘Lost connection. Reason:‘, reason
	
	def clientConnectionFailed(self, connector, reason):
		print ‘Connection failed. Reason:‘, reason

if __name__ == ‘__main__‘:
	reactor.connectTCP(‘localhost‘, 1234, EchoClientFactory())
	reactor.run()

    server 代码例如以下，

#!/usr/bin/python

from twisted.internet import protocol, reactor, endpoints

class Echo(protocol.Protocol):
    def dataReceived(self, data):
        self.transport.write(data)

class EchoFactory(protocol.Factory):
    def buildProtocol(self, addr):
        return Echo()

if __name__ == ‘__main__‘:
    endpoints.serverFromString(reactor, "tcp:1234").listen(EchoFactory())
    reactor.run()