[PyQt] PyQt5 on windows with Python 3.8.2

skruse131087 at gmx.de skruse131087 at gmx.de
Fri Apr 3 09:38:41 BST 2020

Thanks for your reply.
Unfortunately the system is under company control, so I cannot install windows updates by myself. But I saw that this update is from 2011 so it should be installed. And the python installer didn't complain about a missing update.
Since my company will update to win 10 in the next months, I'm comfident that I can update to Python 3.8 afterwards and everything will work correctly ;)

Gesendet: Donnerstag, 02. April 2020 um 14:55 Uhr
Von: "Ian Ottoway" <ian at ottoway.dev>
An: skruse131087 <skruse131087 at gmx.de>
Cc: pyqt <pyqt at riverbankcomputing.com>
Betreff: Re: [PyQt] PyQt5 on windows with Python 3.8.2

I ran into the same issue. There were some security improvements to DLL loading in Python 3.8 that broke for old versions of Windows.  Windows 7 requires Windows Update KB2533623 to be installed as well.

---- On Thu, 02 Apr 2020 07:17:49 -0500 <skruse131087 at gmx.de> wrote ---- 
Dear all,
maybe it's known to the mailing list, but I did not find any information about this:

It seems that PyQt5 currently doesn't work with Python 3.8.2 on a win7 machine.

I installed Python 3.8.2 (64bit) and PyQt5 with pip install pyqt5.
A simple import (python >> import PyQt5.QtCore) produced the following error:
python 3.8 pyQT ImportError: DLL load failed while importing QtCore:

As workaround I uninstalled python 3.8 and installed python 3.7. With python 3.7 everything works as expected.

Best regards
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