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Cannot use Qt4Agg backend in mpl 3.2.1 #17594

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alexysong opened this issue Jun 9, 2020 · 1 comment
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Cannot use Qt4Agg backend in mpl 3.2.1 #17594

alexysong opened this issue Jun 9, 2020 · 1 comment
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v3.2.2

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@alexysong
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Bug report

Bug summary
Can't use qt4agg, error reported below.

Downgrade to matplotlib 3.1.3 solves the problem.

Code for reproduction

import matplotlib as mpl
mpl.use('qt4agg')

Or, set it to Qt4Agg in matplotlibrc file.

Actual outcome

ImportError: cannot import name '_isdeleted' 
Failed to enable GUI event loop integration for 'qt5'

Matplotlib version

  • Operating system: win 10 LTSC 2019
  • Matplotlib version: 3.2.1
  • Matplotlib backend (print(matplotlib.get_backend())): can only use TkAgg
  • Python version: 3.6
@tacaswell tacaswell added this to the v3.2.2 milestone Jun 9, 2020
@tacaswell
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I think this is a duplicate of #16834 which was fixed by #16835 and will be included in 3.2.2 which should be tagged this week.

Thank you for reporting this and sorry it has taken us a while to get a release with the fix out.

@QuLogic QuLogic mentioned this issue Jul 17, 2020
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@tacaswell @alexysong