Hi Vincent, On Monday 25 November 2002 21:54, Vincent Wagelaar wrote: > On Monday 25 November 2002 14:06, Michael Lauer wrote: > > Am Son, 2002-11-24 um 23.35 schrieb Vincent Wagelaar: > > > I am currently working with a QListView and QListViewItem. If I don't > > > derive from these objects speed is great, but derived these objects > > > become very slow. > > > > First of all - > > you are experiencing an inherent fact in the nature of Python bindings > > which support deriving and virtual methods. If you don't subclass, > > there's nearly no Python code involved - if you do subclass, your > > (really really slow - compared to the speed of executing code in C/C++ > > extension modules) Python code is called. There's nothing you can do > > about this fact.
[...] > I think I'll will have to go for the SIP-method because I'm overloading the > paint method in QListViewItem (called a lot). > > The code looks like: > > class MyListViewItem(QListViewItem): > def paint(): > # My overridden paint stuff > def key(): > # My overloaded sorting stuff... > > Overloading QListView shouldn't give a performance degradation because it's > only called once. Nothing compared to how many times MyListViewItem is > called. I can imagine this would give a nice example. If you like to share some code, I'm going to prepare one. > > If this all don't work for you, then I'm afraid you have to implement > > your derived class in C++ and use sip to bind this and use it from > > Python. > > I'm affraid so too, but shouldn't give that many troubles. I've also tried > Psyco but that didn't give a speed boost either. > > Thanks for the reply > > Vincent Bye, Hans-Peter _______________________________________________ PyKDE mailing list [EMAIL PROTECTED] http://mats.gmd.de/mailman/listinfo/pykde
