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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/pythonfrom twisted.internet.protocol import Protocol, ClientFactoryfrom sys import stdoutfrom twisted.internet import reactorclass 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:', reasonif __name__ == '__main__':	reactor.connectTCP('localhost', 1234, EchoClientFactory())	reactor.run()

    server 代码例如以下，

#!/usr/bin/pythonfrom twisted.internet import protocol, reactor, endpointsclass 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()