[QGIS-Developer] set data defined override expression with python?

Nyall Dawson nyall.dawson at gmail.com
Tue Aug 21 15:10:26 PDT 2018

On Wed, 22 Aug 2018 at 01:41, Raymond Nijssen <r.nijssen at terglobo.nl> wrote:
> Hi devs!
> I'd like my python plugin to set an expression for overriding a property
> and I have no clue how to do so. I expect there must be some generic way
> to set expressions.
> Specifically, I want to set the expression for the "Image source" of a
> QgsLayoutItemPicture to:
> '/path/to/pictures/' || attribute(@atlas_feature, 'ID') || '.svg'


    property = QgsProperty.fromExpression( "'/path/to/pictures/' ||
attribute(@atlas_feature, 'ID') || '.svg'")


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