Ok, so I have looked over the ESRI documentation thoroughly and I'm still baffled by the arcpy data access module and the function undo operation.

So far I have tried:

workspace = pathtofile      
edit = arcpy.da.Editor(workspace)   
edit.startEditing(with_undo = True)
arcpy.CalculateField_management("MyTable", "LIFEFORM", 5000)

The undo operation does nothing and the undo button in the user interface indicates that it will remove the added layer, not the field calculate that I just performed.

I was hoping that I could implement the da.Editor into an addin toolbar as a way of avoiding the user from having to turn on an extension or start an edit session on a separate toolbar.

  • You need to use the Editor cursor to make the edits, not some other tool.
    – Vince
    Commented May 12, 2015 at 15:56

1 Answer 1


undoOperation is only supported if working with versioned data. As per the arcpy.da.Editor help: "Nonversioned edit sessions do not support undo and redo operations."

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