Mailman 3 [Twisted-Python] python properties in twisted don't work - Twisted

18 Dec 2008


      Hello everyone!
I have a problem, if I try to use python property in a twisted program, 
it doesn't really work...the accessor works but as soon as I use the 
mutator, it no longer uses the property (and doesn't set the "real" 
variable. I tried an example without twisted, it works, and with the 
twisted example it doesn't... does anyone know what is going on? Thank you!
Gabriel
#-------------------------------------------------------------------------------------------------------
# This doesn't work, why????
#-------------------------------------------------------------------------------------------------------
from twisted.internet.protocol import Protocol, ClientFactory
from sys import stdout
class Echo(Protocol):
def __init__(self):
        self.__x = None
def __getx(self):
        return self.__x
def __setx(self, value):
        if(value != 0):
            self.__x = value
def __delx(self):
        del self.__x
x = property(__getx, __setx, __delx, "the doc")
def connectionMade(self):
        t = self.x
        assert t is None
        self.x = 4
        assert self.__x == 4
        t = self.x
        assert t == 4
        self.x = 0
        assert self.__x == 4
        t = self.x
        assert t == 4
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__"):
from twisted.internet import reactor
    reactor.connectTCP("localhost", 4444, EchoClientFactory())
    reactor.run()
#-------------------------------------------------------------------------------------------------------
# This works, as expected
#----------------------------------------------------------------------------------------------------
class C(object):
def __init__(self):
        self._x = None
def __getx(self):
        return self._x
def __setx(self, value):
        if(value != 0):
            self._x = value
def __delx(self):
        del self._x
x = property(__getx, __setx, __delx, "The doc")
if(__name__ == "__main__"):
c = C()
    t = c.x
    assert t is None
    c.x = 4
    assert c._x == 4
    t = c.x
    assert t == 4
    c.x = 0
    assert c._x == 4
    t = c.x
    assert t == 4