Not all leakage problems caused by qt or python. There is a wrapping layer between Qt and Python provided by SIP. Therefore, SIP may cause leakages. Also PyQt had a paintCell memory leakage problem several months ago. If you're using an old snapshot of PyQt or SIP, that would be a problem. Try using the latest snapshots. Also mention your versions and problems to the PyKDE mailinglist, it could be more helpful.
If you want to delete C++ objects in Qt, consider using QObject.deleteLater() method. IMHO, this won't help. Mike -- http://mail.python.org/mailman/listinfo/python-list