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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 Pyqgs ?

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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

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