I have loaded multiples duplicated layers in QGIS with different filters. I wonder if it is possible to find the layers that haven't any filter (setSubsetString method) with PyQGIS?

2 Answers 2



Loop over all registered layers and check if subsetString is empty.

layers = QgsMapLayerRegistry.instance().mapLayers()

for name, layer in layers.items():
    if not layer.subsetString():
        print 'layer %s has empty subsetString'% name


Adopted version of @Detlev's answer:

from qgis.core import QgsProject, QgsVectorLayer

layers = QgsProject.instance().mapLayers()

for layer in layers.values():
    if isinstance(layer, QgsVectorLayer):
        if not layer.subsetString():
            print(f"Layer '{layer.sourceName()}' has empty subsetString")


from qgis.core import QgsProject, QgsVectorLayer

layers_not_filtered = [
    lyr for lyr in QgsProject.instance().mapLayers()
    if isinstance(lyr, QgsVectorLayer) and
    not lyr.subsetString()

fmt_print = lambda lyr: print(f"Layer '{lyr.name()}' has empty subsetString")
_ = list(map(fmt_print, layers_not_filtered))
  • @J.Monticolo, thank you for your magic (even if it is a bit longer ^_^)
    – Taras
    Dec 13, 2022 at 10:24
  • I disagree, 4 lines. And the goal is to get a list of not filtered layers, achieved in one line instead of 5. Dec 13, 2022 at 10:34

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