PySide6.1 not compatible with matplotlib 3.4

Question

When I only install PySide6, the GUI program works well, but once I have installed matplotlib with its dependency packages(including pyqt5), then the GUI program won't work and output the error message below

This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

The problem won't be resolved even after uninstalling matplotlib again, in addition, the matplotlib is even not imported in my program.

Python version: 3.9.4
PySide6 version: 6.1
matplotlib: 3.4.2
pyqt: 5.12.3

In addition, PySide6 is installed via pip and matplotlib is installed via conda.

score 3 · Answer 1 · answered Jun 03 '21 at 05:38

3

Reviewing the source code and not knowing an official announcement I can point out that at the time of writing this post matplotlib does not support any Qt6 backend so PySide6 will not be used.

Reviewing this pull request I see that they are working on incorporating it so that Qt6 will probably already be supported in future releases.

answered Jun 03 '21 at 05:38

eyllanesc

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That’s correct. Pyqt6 is not supported yet. – Jody Klymak Jun 03 '21 at 14:17
Looks like that PR got merged two days ago, so hopefully support for Qt6 will be coming soon? – Christian Reall-Fluharty Aug 08 '21 at 00:00
Is the compatibility issue resolved yet? – Pherdindy Sep 27 '21 at 07:21
1

@Pherdindy There is still no release where this feature is added so if you want to use it then you will have to compile matplotlib using Github source code. – eyllanesc Sep 27 '21 at 07:26

score 0 · Answer 2 · answered Apr 24 '23 at 14:19

0

I had trouble with pyside6 and matplotlib I did perform an update

update to solve compatibility problems

python -m pip install -U matplotlib and it seems to work now.

answered Apr 24 '23 at 14:19

Antoine Letoublon

1

PySide6.1 not compatible with matplotlib 3.4

2 Answers2

update to solve compatibility problems

Linked