Set fixed reference scale for QGIS layer with PyQGIS?

Question

Is it possible to set a fixed reference scale for a QGIS layer using PyQGIS?

I try this script but it doesn't work:

lyr = iface.activeLayer()

r = QgsFeatureRenderer()
r.setReferenceScale(400_000)
lyr.setRenderer(r)

Answer 1

You can set a reference scale by getting the renderer of the active layer. You don't need to make a new QgsFeatureRenderer.

lyr = iface.activeLayer()
r = lyr.renderer()
r.setReferenceScale(400_000)