[Qgis-developer] Qt5 and Python 3

[Nathan Woodrow]

What do we get if not PyQtNullVariant?

On Wed, 4 May 2016 7:01 pm Matthias Kuhn <matthias at opengis.ch> wrote:

> Hi,
>
> I have just published a post with the state of Python 3 and Qt 5 migration.
>
> http://www.opengis.ch/2016/05/04/qgis-qt5-and-python3-migration-current-state/
>
> In general I am very happy with what we have achieved so far.
>
> There is one problem that I think needs broader discussion which is an
> issue about the handling of NULL values in PyQt5. With the equivalent to
> the SIP API V2 we don't have PyQtNullVariant up to PyQt 5.6. This
> basically means, no NULL for python plugins. And I consider this a blocker.
>
> We could
>
>  * Switch to another API (sip.enableautoconversion(false), similar to
> SIP API V1). Resulting in countless lines of code in plugins requiring
> to be updated.
>  * Bump the minimum Qt version to 5.7 (and hope that PyQtNullVariant
> will be fixed there, chances are good, see
> https://www.riverbankcomputing.com/pipermail/pyqt/2016-April/037336.html).
>
> I tend towards Qt >= 5.7 - on Windows and Mac we control the
> dependencies, so that should be ok anyway, on Linux we can say "if you
> want a recent QGIS, get a recent distro". And by the time we actually
> ship QGIS with a Qt5 dependency there should be a number of distros with
> Qt 5.7.
>
> Any opinion on this?
> Matthias
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