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python的twisted比较有意思，既可以做server方面的编程，也可以做client方面的编程。关于这方面的编程，最简单的例子就是echo。
client 代码如下，
#!/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 代码如下，
#!/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()