I tried to calculate an area with: gp.CalculateField(fcGFE_Result,'AREA','!SHAPE.AREA!','PYTHON') When I use the internation settings with a . as decimal separator everything is doing just fine. But my localsettings are set to ((Dutch_Netherlands)) with a "," as a decimal separator. The error message I got is: gp.CalculateField(fcGFE_Result,'AREA','!SHAPE.AREA!','PYTHON') arcgisscripting.ExecuteError: ERROR 000539: Error running expression: 304852,037832481 <type 'exceptions.SyntaxError'>: invalid token (<string>, line 1) When I using the same command within ArcMap I got no problem. I also tried to set the locale parameters: locale.setlocale(locale.LC_ALL, 'C') and locale.setlocale(locale.LC_ALL, '') Is there anybody with a proper solution? Now I am using a workarround, but I am still curious....
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