In QGIS, what is the simplest python code (least possible) to verify if a particular layer is PRESENT or ABSENT in the Map Layers list?
NOTE: The script shouldn't trip an error IF the layer is ABSENT.
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len(QgsMapLayerRegistry.instance().mapLayersByName('the_Map_Layer_in_question')) != 0
Trueif layer exists, otherwise
boolean = False layers = QgsMapLayerRegistry.instance().mapLayers() for name, layer in layers.iteritems(): if layer.name() == ('the_Map_Layer_in_question'): boolean = True # if the map layer exists boolean == True, if it doesn't boolean == False