Layer.visible property when using 'arcpy.mp.ConvertWebMapToArcGISProject'

[Arne_Gelfert]

What determines whether an arcpy map layer that was created as part of a created created using ...

result = arcpy.mp.ConvertWebMapToArcGISProject(WEB_MAP_AS_JSON)‍

can be turned off? I'm creating a map from the above...

aprx = result.ArcGISProject
mymap = aprx.listMaps()[0]‍‍

But when I try turn layers invisible, I get this for some:

The attribute 'visible' is not supported on this instance of Layer.‍

The layers all derive from a Portal webmap so that they have...

layer.isWebLayer = True‍

Most of my layers don't have that issue and wilingly switch to :

layer.visible = False
>> Success‍‍

Is this limitation based on a setting in the webmap or in the underlying map services (item) ? Thanks.

[Arne_Gelfert]

So to refine my approach after re-reading the documentation on layer properties and methods, I try this:

# ... while iterating over layers

print("Layer Name: "+layer.name)
print("Layer visible: ",layer.visible)
print("Layer supports 'visible': ",layer.supports("visible"))
if layer.supports("visible"):
   try:
      layer.visible = !layer.visible
      print("Switched Layer visibility")
   except Exception as e:
      print("Unable to switch visibility")
      print(e)
      print("Layer visible: ",layer.visible)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

On most cases, there result is as expected:

Layer Name: My Well Behaved Layer
Layer visible: True
Layer supports 'visible':  True
Switched Layer visibility
Layer visible: False‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

But in other cases, I get this:

Layer Name: My Poorly Behaved Layer
Layer visible: True
Layer supports 'visible':  True
Unable to switch visibility
The attribute 'visible' is not supported on this instance of Layer.
Layer visible: True‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

It seems that it the layer says it supports 'visible', it should do so. Would love to know how to make sense of this.

[DanPatterson]

line 8

layer.visible = !layer.visible

is that =! a formatting or copy issue?  (ie space between =, ! and lack of space between ! and layer...

A shortcut perhaps, but

case = not case  # ie.  layer.visible = not layer.visible

is a little less prone to format issues and misinterpretation

[Arne_Gelfert]

Sorry ,,, never a good idea to tweak things in transition from IDE to Geonet... I'm flipping the attribute to its Boolean opposite, so it should read:

layer.visible = not layer.visible

If it was visible to begin with, I want to hide it, and the other around. Any idea why this would fail for some layers? Thanks, Dan.

[DanPatterson]

Arne Gelfert‌I don't know offhand since I am usually working with data I create myself... so everything is perfect of course .

If you get a list of layers that don't work, you may be able to determine some communalities between them... assuming that there isn't some random or obscure bug.

[Arne_Gelfert]

So I'm stumped on this one. I've gone ahead and republished my map service in question here, and now I'm seeing even weirder behavior. But since it doesn't merely relate to the 'visible' property, I'll start a new thread. Thanks for chiming in, Dan.