human
I wrote the below code

    (authCert, serverCert) = certificatesForAuthorityAndServer()
    @implementer(IHandshakeListener)
    class Client(AccumulatingProtocol, object, ):
        handshook = False
        peerAfterHandshake = None
        def connectionMade(self):
            super(Client, self).connectionMade()
            if (clientGreetingData is not None):
                self.transport.write(clientGreetingData)
        def handshakeCompleted(self):
            self.handshook = True
            self.peerAfterHandshake = self.transport.getPeerCertificate()
            if clientAbortAfterHandshake:
                self.transport.abortConnection()
        def connectionLost(self, reason):
            pass
    @implementer(IHandshakeListener)
    class Server(AccumulatingProtocol, object, ):
        handshaked = False
        def handshakeCompleted(self):
            self.handshaked = True
        def connectionLost(self, reason):
            pass
    clientF = TLSMemoryBIOFactory(optionsForClientTLS(u'example.com', trustRoot=authCert), isClient=True, wrappedFactory=ClientFactory.forProtocol((lambda : Client(999999))))
    serverF = TLSMemoryBIOFactory(serverCert.options(), isClient=False, wrappedFactory=ServerFactory.forProtocol((lambda : Server(999999))))
    (client, server, pump) = connectedServerAndClient((lambda : serverF.buildProtocol(None)), (lambda : clientF.buildProtocol(None)), greet=False)
    return (client, server, pump)

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def handshakingClientAndServer(clientGreetingData=None, clientAbortAfterHandshake=False):