Traversing subgroups and group layers with PyQGIS

Question

I am trying to find the name of subgroups using PyQGIS. I have been trying to use Playing with subgroups

I am however unable to traverse and get the names of the subgroup. I have tried the code on this article.

for child in root.children():
  if isinstance(child, QgsLayerTreeGroup):
    print "- group: " + child.name()
    if child.name() == "test": #to check subgroups within test group
        for child in root.children(): #which I think i am making a mistake here because the root is supposed to contain all nodes

Hi @kartoza-geek, can you elaborate on the output of the above script and at which stage it fails? — Matthias Kuhn, Sep 07 '15 at 17:55
The script runs well but does not give expected results. If I have a group layer called test and subgroups called test 1 and test 2 they are not printed — kartoza-geek, Sep 07 '15 at 18:55
Try for subChild in child.children(): and then print subChild.name(), since you want to start reading children from your main group (not from root anymore). — Germán Carrillo, Sep 07 '15 at 19:20
for some reason it does not work. It throws an error QgsLayerTreeLayer' object has no attribute 'name. — kartoza-geek, Sep 08 '15 at 07:06
Perhaps you could mention which version of QGIS you are using please? I can confirm (using QGIS 2.8.2) that @gcarrillo 's suggestion works. — Joseph, Sep 08 '15 at 09:48
it does work. I can confirm as well. for subChild in child.children(): if if isinstance(subchild, QgsLayerTreeGroup): and then print the subChild.name() — kartoza-geek, Sep 08 '15 at 09:54
I'll post it as an answer, so that we can mark this question as answered. — Germán Carrillo, Sep 08 '15 at 14:04

score 4 · Accepted Answer · answered Sep 08 '15 at 14:04

4

Since you want to start reading children from your main group (not from root anymore), try this (pay attention to the last 3 lines):

for child in root.children():
  if isinstance(child, QgsLayerTreeGroup):
    print "- group: " + child.name()
    if child.name() == "test": #to check subgroups within test group
        for subChild in child.children():
            if isinstance(subChild, QgsLayerTreeGroup):
                subChild.name()

answered Sep 08 '15 at 14:04

Germán Carrillo

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yes, it worked. That's the code I ended up using. thanks for the help – kartoza-geek Sep 08 '15 at 14:20

Traversing subgroups and group layers with PyQGIS

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