py3-qt5 doesn't provide qtwebchannel bindings
They are required by py3-qtwebengine and will fail otherwise.
Python 3.7.3 (default, Apr 17 2019, 11:48:37)
[GCC 8.3.0] on linux
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>>>import PyQt5.QtWebEngineWidgets
Traceback (most recent call last):
File “”, line 1, in
ModuleNotFoundError: No module named ‘PyQt5.QtWebChannel’
>>>
(from redmine: issue id 10466, created on 2019-05-18, closed on 2019-06-19)