WebMap object getting TraitError from webmapitem

Question

Hi all,

I'm using the example from the ArcGIS Python API doco on how to search for portal items, filter by Web Map. From here I want to get the list of layers within this map but I'm getting an TraitError

wm_item = gis.content.get('6229f30bb378405397b24615e8dcaf60')

wm = WebMap(wm_item)

TraitError: The 'comm' trait of a Layout instance must be a Comm or None, but a value of class 'ipykernel.comm.comm.Comm' (i.e. <ipykernel.comm.comm.Comm object at 0x000002630B46DE48>) was specified.

Currently using the python within ArcGIS Pro 2.7 with Patch 4 applied.

Has anybody come across this/know what I'm doing wrong?

Thanks

CSDING_GIS · Answer

I'm running into the same error, except the error statement reads a little bit different now:

traitlets.traitlets.TraitError: The 'comm' trait of a Layout instance expected a Comm or None, not the Comm at '0x1ef84ef3d90'.

I'm getting this error in a jupyter notebook, but also in the direct python window.

I'm on Pro v3.3.1 wirh Python v3.11.8

Chris_Kell · Answer

I found this post via Google, and restarting pro worked for me.  Thanks for the tip!

JeffreyBurka · Answer

(old question, but I just ran into the same thing and found this, so I'm adding what worked for me so google will crawl it!)

As far as I could tell, this was basically just a problem the jupyter kernel being unhappy in Pro. Quitting and relaunching Pro cured the issue for me.

A little more detail on my situation: I wrote a python script and got it working the way I wanted, then used that as the basis for a Python Toolbox (.pyt). When running the tool created from the script, I was getting the "The 'comm' trait of a Layout instance expected a Comm or None trait" error while creating a WebMap from a web map item already retrieved from the portal. The standalone script continued to work; only the GP tool was failing in this way. Quitting and relaunching Pro cleared it up.