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I know I can pull a vector file into my current project using:

vlayer = iface.addVectorLayer(r"S:/Data/Natural_Earth_quick_start/110m_cultural/ne_110m_admin_0_countries.shp", "admin", "ogr")

But if I create my layer using something like:

vlayer = QgsVectorLayer(r"S:/Data/Natural_Earth_quick_start/110m_cultural/ne_110m_admin_0_countries.shp", "admin", "ogr")

and then I do some processing on vlayer how do I then add it to the current project or map layers list?

  • 1
    Can you expand on what you mean by "processing"? Editing the layer such as modifying features, running a tool from the processing toolbox etc? Or do you mean something like: QgsProject.instance().addMapLayer(vlayer)? – Joseph Mar 6 at 13:00
  • that is the correct answer – Ian Turton Mar 6 at 13:05
  • Any sort of process that changes the layer features – Ian Turton Mar 6 at 13:05
  • You can see in the PyQGIS cookbook how to add a QgsVectorLayer to the project docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/… – etrimaille Mar 6 at 15:33
  • @etrimaille - thanks, I spotted that soon after I got the answer here :-) – Ian Turton Mar 7 at 8:02
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  • To add an existing single layer:

    vlayer = QgsVectorLayer("some/path/to/shapefile.shp", "admin", "ogr")
    QgsProject.instance().addMapLayer(vlayer)
    

  • To add existing multiple layers:

    vlayer1 = QgsVectorLayer("some/path/to/shapefile1.shp", "admin1", "ogr")
    vlayer2 = QgsVectorLayer("some/path/to/shapefile2.shp", "admin2", "ogr")
    layers = [vlayer1 , vlayer2]
    QgsProject.instance().addMapLayers(layers)
    

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