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[mjmiddle]

from SpaceClaim.Api.V23 import Application
from SpaceClaim.Api.V23.Scripting.Internal import TransactionHelper
def Undo():
    TransactionHelper.EndCommand()
    Application.Undo(1)    # number of steps to undo
    #Application.Redo(1)    # number of steps to redo
    #Application.PurgeUndo(0)    # number of steps to keep
    TransactionHelper.BeginCommand("Script")
Undo()

# The Undo(), Redo(), PurgeUndo() must be done within the EndCommand()/BeginCommand() block and inside a function or else the BeginCommand() cannot resume GUI operation.