I have needed to manage layer groups in ArcMap many a time, across 77+ county maps. I would like to be able to update the entire group layer rather than have to write code to do each layer. All the for loops and what not when it would be so easy to just apply it to the entire group.
I realize this is an old request. Can you please clarify the workflow and provide example of what you are trying to do? We won't make new arcpy.mapping changes to ArcMap but if this is still a requirement for ArcGIS Pro, please provide more detail.
Jeff - arcpy.mp and Layout teams
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