PyQt5 and Big Sur

[Eric Larson]

Beautiful, QT_MAC_WANTS_LAYER=1 works for me!

Eric


On Tue, Nov 17, 2020 at 8:33 AM Marius Shekow <
marius.shekow at fit.fraunhofer.de> wrote:

> Hi, I also found that setting the environment variable
> QT_MAC_WANTS_LAYER to "1" fixes the problem, as per
>
> https://stackoverflow.com/questions/64818879/is-there-any-solution-regarding-to-pyqt-library-doesnt-work-in-mac-os-big-sur/64856281
>
> No idea, why it works, but it's a good workaround for your early adoper
> users who accuse you, the app developer, to have "broken everything".
> Shame on me... (sarcasm).
>
> Am 15.11.2020 um 23:35 schrieb Jeremy Katz:
> >
> > On 15/Nov/20 04:50, Eric Larson wrote:
> >> I recently updated to Big Sur (11.0.1). I have Qt5Agg set as my
> >> matplotlib backend. Opening a matploltlib figure in interactive mode now
> >> causes the interpreter to hang on 5.12 and 5.15.1. Even running a hello
> >> world <https://pythonprogramminglanguage.com/pyqt5-hello-world/>
> example
> >> causes the interpreter to hang.
> >>
> >> I tried the same matplotlib code with pyside2, and there at least the
> >> interpreter would not hang. For both PyQt5 and pyside2, however, no
> >> window actually showed up, even though an icon did appear. So it seems
> >> at least some of this is probably a problem at the level of Qt rather
> >> than PyQt5.
> > I had an apparent application hang with PyQt and Qt 5.15.0, and an
> > application bundle created with PyInstaller. Dtruss revealed that the
> > application was executing, but very slowly. IIRC, the main window went
> > from displaying in ~5 seconds with macOS Catalina to 4 minutes with Big
> Sur.
> >
> > Running the application once with "open -F" seemed to resolve the issue
> > permanently.
> >
> --
> Dr. Marius Shekow
> Mixed and Augmented Reality Solutions, Fraunhofer FIT
> http://www.fit.fraunhofer.de/mars
> Tel.: +49(0)2241 - 14-3555
>
>
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