I have a lot of coordinates in attribute table like this one:

enter image description here

I'm looking the way how to find and select on active layer duplicated points using Python in QGIS ? I needn't delete them but only find and show (or select).

  • Do your duplicate point need to have all the same attributes or only a some of them?
    – mgri
    Jan 23, 2017 at 21:15
  • Yes, duplicates overlaps.
    – Artec
    Jan 23, 2017 at 21:16
  • Thanks, but I don't understand if you need a spatial query or a query on the attributes.
    – mgri
    Jan 23, 2017 at 21:19
  • The same attributes are only X and Y. The rest can be but not always.
    – Artec
    Jan 23, 2017 at 21:20
  • In this case I need spatial query. "X,Y" in this table represents physical points wchich can be duplicated. I'm looking the way how to select points (with using geometry not attributes).
    – Artec
    Jan 23, 2017 at 21:25

1 Answer 1


This code should do the job (you need to have your layer activated before running it from the Python Console):

layer = iface.activeLayer()

index = QgsSpatialIndex()
for ft in layer.getFeatures():
    allfeatures[ft.id()] = ft

selection = []
for feat in layer.getFeatures():
    inGeom = feat.geometry()
    idsList = index.intersects(inGeom.boundingBox())
    if len(idsList) > 1:
        for id in idsList:
layer.setSelectedFeatures([k.id() for k in selection])
  • Thanks for your quickly help but at last row I've got error File "<input>", line 7 layer.setSelectedFeatures([k.id() for k in selection]) ^ SyntaxError: invalid syntax
    – Artec
    Jan 23, 2017 at 21:42
  • Which QGIS version are you using? It's working for me (QGIS 2.18.2)
    – mgri
    Jan 23, 2017 at 21:44
  • Now I'm using 2.16.3 but sometimes use older (2.12 Lyon).
    – Artec
    Jan 23, 2017 at 21:47
  • These function didn't change from your version... That's really weird, I'm pretty sure there is some problem with the copy&paste of the code.
    – mgri
    Jan 23, 2017 at 21:50
  • You have right. I need to paste separately the last row layer.setSelectedFeatures([k.id() for k in selection]) and it works great !
    – Artec
    Jan 23, 2017 at 21:55

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