[PyQt] Using __hash__ functions for custom classes

Stephen Knox stephenknox73 at gmail.com
Tue Mar 31 01:58:09 BST 2020

Noob question here.

Is there any guidance on how to implement __hash__ functions for custom
classes. Should they be generated automatically if there is a qHash

I am trying specifically to debug this issue:
https://github.com/qgis/QGIS/issues/29225, which is caused by the
QgsActionScope class not having a hash function. There is an __eq__
function but no __hash__ function.

Code is at
https://github.com/qgis/QGIS/blob/master/src/core/qgsactionscope.h and

I have tried implementing a special-method in the sip.in file but can't
seem to get the syntax right, and I am unsure whether this is necessary or


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