[QGIS-Developer] Expressions with aggregate in PyQGIS

[Anita Graser]

Hi,

I'd like to add an example of an aggregate expression to my recent PyQGIS
101 tutorial on expressions [0]. I got expressions for individual features
working but cannot figure out how to set the context for aggregate
expressions correctly.

As far as I can tell, the PyQGIS Cookbook doesn't contain any information
on this either [1].

I'd appreciate any examples!

Regards,
Anita

[0]
https://anitagraser.com/pyqgis-101-introduction-to-qgis-python-programming-for-non-programmers/pyqgis-101-using-expressions-to-compute-new-field-values/
[1]
https://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/expressions.html#evaluating-expressions
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