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How can I create a new group in the layer manager using python code?

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Adding groups to the Layers Panel

Using the new Layer tree (introduced since QGIS v.2.4 and available for QGIS v3.x) you can add a group to the QGIS ToC this way:

root = QgsProject.instance().layerTreeRoot()
myGroup1 = root.addGroup("My Group 1")

If you want to add it to a particular position in the ToC, use:

myGroup1 = root.insertGroup(2, "My Group 1")

Adding groups into other groups

You can even create nested groups (a group into a group):

myGroupA = myGroup1.addGroup("My Group A")

If you need to first find an existing group where to put your new group, use this: 

myOriginalGroup = root.findGroup("My existing group") # We assume the group exists
myNewGroup = myOriginalGroup.addGroup("My New Group")

You can learn more on Layer tree handling here and here.

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  • I cannot find explanation to what ToC means?
    – J.A.Cado
    Commented Dec 7, 2017 at 8:42
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    Layer tree, legend, ToC, they are names normally used in GIS when refering to the list of layers and groups in a software.
    – Germán Carrillo
    Commented Dec 7, 2017 at 13:51
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There is the method QgsLegendInterface.addGroup( name, expand, parent )

Example:

iface.legendInterface().addGroup( 'abc')
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  • Thank you very much, the problem was that I did not refer to the interface and used directly QgsLegendInterface.addGroup
    – malagueff
    Commented Jul 16, 2013 at 11:54
  • Is there any way to control the position where you insert the menu? The menu is inserted under the shape you have selected. I need to put it above all layers. Thanks.
    – malagueff
    Commented Jul 17, 2013 at 5:35
  • @malagueff, Please edit your question per your comment.
    – artwork21
    Commented Apr 2, 2014 at 14:36

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