[PyQt] Event loop is already running warning message

[Phil Thompson]

On Tuesday 05 February 2008, Darren Dale wrote:
> Hello,
>
> A while back I inquired about some warning messages that appear in a
> threaded application at each timeout, which was addressed in a subsequent
> PyQt4 release:
> http://thread.gmane.org/gmane.comp.python.pyqt-pykde/9800/focus=9803
>
> A similar problem occurs with QCoreApplication, it can be seen by starting
> ipython:
>
> $ ipython --q4thread
>
> >>> cpaste
>
> QCoreApplication::exec: The event loop is already running
> QCoreApplication::exec: The event loop is already running
> ...
> That warning is also produced at each timeout. Is it possible to silence
> this message?
>
> Thank you,
> Darren

It's not quite the same issue as before because if you change your original 
test to use QCoreApplication rather than QApplication then there is no 
problem.

It would seem to be an ipython problem. PyQt now does some of what ipython 
does and the two implementations will conflict. PyQt allows its own 
implementation to be disabled - but I don't know if ipython takes advantage 
of that. The relevant functions are QtCore.pyqtRemoveInputHook() and 
QtCore.pyqtRestoreInputHook().

Phil