Best way to figure out what kind of layer I've got?

04-08-2019 09:01 AM
by Anonymous User
Not applicable

I'll try to start simple and add detail if necessary, but my question is general - "Layers" in the ArcGIS API for Python refers to so many things, I need a way to discern what kind of layer I've got in any situation, so that I know what properties are available.

I need to list layers in web maps. ArcGISMapServiceLayer, which can be grouped, is a troublemaker, because of sublayers and groups (each of which is a 'layer.'). I need to check whether or not I am at a group layer, and therefore need to keep "going down" before I can interrogate the layer for its popupInfo, field name, etc...

I can use json, but I'm wondering if there is a more direct way. Can I check for a property without directly loading in the JSON?

if lyr.layerType == 'ArcGISMapServiceLayer':
   l1_json = json.loads(str(lyr))
      if l1_json.get('layers'):



ie. if lyr.layers is None or something? I've tried this and had no luck.

Thank you for your time,

Randy McGregor

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1 Reply
by Anonymous User
Not applicable

Actually, you can interrogate the objects directly. This works:


   if 'layers' in lyr:

      Do something


      Do something els

No need to load the json for this particular check. 

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