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

[Drew Smathers]

Protocol is an old-style class - doesn't inherit from object - so
property won't work in that context.  This won't be a problem in
python 3 - old-style/new-style classes are consolidated.

-Drew

On Thu, Dec 18, 2008 at 8:35 AM, Gabriel Rossetti
<gabriel.rossetti at arimaz.com> wrote:
> 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
>
>
>
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>



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               d.p.s