[PyQt] possible regression

Phil Thompson phil at riverbankcomputing.com
Mon Jul 9 17:20:02 BST 2012

On Mon, 09 Jul 2012 17:28:31 +0200, Sebastian Elsner
<sebastianelsner at freenet.de> wrote:
> Hello,
> I am updating some code to use PyQt-Py2.6-x86-gpl-4.9.4-1.exe. I have 
> previously used PyQt-Py2.6-x86-gpl-4.8.6-1.exe. With the code attached I

> get a runtime error in 4.9.4 I did not get in the 4.8.6.
> Please execute the attached py file and click the open button in the 
> window appearing. This opens a dialog. Close the dialog and click the 
> signal button. Here I am getting an error:
> Traceback (most recent call last):
>    File "pyqt_runtimeerror.py", line 50, in check
>      print "test checked", self.isChecked()
>    File "pyqt_runtimeerror.py", line 28, in isChecked
>      return self.checkBox.isChecked()
> RuntimeError: wrapped C/C++ object of %S has been deleted

The %S is obviously a (sip) bug, but it doesn't affect anything.

> To get rid of the problem I can comment line 8 (self.dialog = parent). 
> Is this something I should fix in my app and was the 4.8.6 behaviour 
> unintened or is this a bug?

The current behaviour seems perfectly reasonable to me. The C++ dialog and
its contents are destroyed when the dialog is closed. The corresponding
Python objects are still alive because you have an explicit reference. If
you remove that explicit reference (by commenting out line 8) then the
Python objects get garbage collected. You don't get an exception in that
case because the connection was broken when the slot object was garbage


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