I need a python script that I can use to create a schematic diagram, and add it to an mxd. This must be done in an independent script and I cannot do it in arcmap.
The problem is I can't get arcpy to add the diagram layer to the map. I run arcpy.schematics.CreateDiagram to create the diagram and that works, but when I try to use arcpy.mapping.AddLayer to add the return from the diagram it throws an AssertionError. I have also tried to use arcpy.mapping.Layer but that throws the same error.
Can someone PLEASE tell me how to add a schematic diagram to an MXD with arcpy?