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The following script joins two layers on a common id and attempts to use the OBJECTID in the joined table to update records for a field in the input table. In running it in "current" mode, it moves through the join process ok but then errors out with Calculate. OBJECTID is from a joined table and I am joining it to an Annotation class, but I'm not sure that is relevant. Any ideas as to why this doesn't complete?

    mxd = arcpy.mapping.MapDocument("Current")
    dflist = arcpy.mapping.ListDataFrames(mxd)
    for df in dflist:
        if df.name == "County":
            for lyr in (arcpy.mapping.ListLayers(mxd, "", df)):
                if lyr.name == "County Insets":
                    CoInset = lyr
                elif lyr.name == "County Insets Anno":
                    CoAnno = lyr
            print 'Joining ' + CoInset.name + ' to ' + CoAnno.name
            arcpy.AddJoin_management(CoAnno, "TempID", CoInset, "TempID")
            expression = "!" + CoInset.name +".OBJECTID!"
            arcpy.CalculateField_management(CoAnno, "FeatureID",  expression, "PYTHON")

This gives me the following error:

Runtime error  Traceback (most recent call last):   
File "<string>", line 14, in <module>   File "c:\program files (x86)\arcgis\desktop10.1\arcpy\arcpy\management.py", line 3129, in CalculateField     raise e <br>
ExecuteError: ERROR 000539: Invalid field County Insets.OBJECTID Failed to execute (CalculateField).
5

Try:

expression = "!" + CoInset.datasetName +".OBJECTID!"

instead of:

expression = "!" + CoInset.name +".OBJECTID!"

The joined fieldnames should reflect the feature class/annotation's workspace name, not table-of-contents name.

| improve this answer | |
  • That was the trick! Thanks for the quick and on target response. It can be maddening trying to figure out simple syntax issues like this. Thanks for the help! – Bernie Sep 18 '14 at 18:17

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