Sundance, That's it! I didn't realized the last_traceback was keeping the reference to the frame.
Thanks for your help! Fabio Menegazzo On Wed, Dec 10, 2008 at 9:26 AM, Sundance <[EMAIL PROTECTED]> wrote: > Fabio Menegazzo wrote: > > > Consider a widget in the display. When an exception happens the Python > > frame never dies. Am I doing something wrong? > > Hi Fabio, > > In your example, your exception occurs while the frame for > SlotRaiseError() is still on the stack. The traceback thus keeps a > pointer to that frame, which is why the stub variable's refcount doesn't > reach 0. You are trying to use sys.exc_clear(), but that function makes > strictly no promise as to what variables are going to get cleared, or > when (see http://effbot.org/pyref/sys.exc_clear.htm). In particular, it > doesn't clear the reference to the last traceback that is available in > the sys module. > > Contrast the example: > > ---[ Example ]--------------------------------------------------------- > import sys > from PyQt4 import Qt > > class Stub: > > def __init__( s ): > print "I'm a stub instance and I was just created!" > > def __del__( s ): > print "Whoops, my refcount is zero and now I die!" > > > class TestClass: > > def causeHavoc( s ): > > stub = Stub() > raise Exception( "Whoops, an error occurred!" ) > > def clearTraceback( s ): > > print "Deleting last traceback..." > sys.last_traceback = None ## HERE! > > def start( s ): > > app = Qt.QApplication( sys.argv ) > Qt.QTimer.singleShot( 1000, s.causeHavoc ) > Qt.QTimer.singleShot( 2000, s.clearTraceback ) > Qt.QTimer.singleShot( 3000, app.quit ) > app.exec_() > > t = TestClass() > t.start() > ----------------------------------------------------------------------- > > In this example, the stub variable is correctly collected when the > reference to the traceback is deleted. > > In short: business as usual. Python works fine, it just keeps a > reference to the last traceback that you didn't know about. :) > > Hope this helps, > > -- S. > _______________________________________________ > PyQt mailing list PyQt@riverbankcomputing.com > http://www.riverbankcomputing.com/mailman/listinfo/pyqt >
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