PyQt5 and Big Sur

[Thomas Caswell]

Great, thank you for your work Phil!

Tom

On Tue, Nov 17, 2020, 11:33 Phil Thompson <phil at riverbankcomputing.com>
wrote:

> Note that PyQt v5.15.2 will set this automatically.
>
> Phil
>
> On 17/11/2020 14:16, Eric Larson wrote:
> > 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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