I encountered the same issue (discussed above) today and so developed the Python test script below to demonstrate it. If you run it the expected result is to see the shape area figure printed 3 times but you only see it twice accompanied by the Python error below the code.The error is seen at ArcGIS 10.0 SP4 so I am hoping might be addressed by 10.1. Could someone with 10.1 Pre-release already installed perhaps run the test and see if the problem persists. If in_memory workspaces work like this by design rather than oversight perhaps that can be documented in the 10.1 Online Help (that is now accessible via resources.esri.com).In my application I will be able to workaround it by using CopyFeatures_management to get the feature class back on disk before trying to access its Shape_Area but I'm iterating through 100+ feature classes so would have preferred not to lose that copying time. The in_memory is otherwise working very well to perform 100+ iterations of Intersect between the CopyFeatures to and now as a workaround from in_memory.import arcpy
if arcpy.Exists("C:/Temp/Test.gdb"):
arcpy.Delete_management("C:/Temp/Test.gdb")
if arcpy.Exists("in_memory"):
arcpy.Delete_management("in_memory")
arcpy.CreateFileGDB_management("C:/Temp","test","CURRENT")
arcpy.CreateFishnet_management("C:/Temp/test.gdb/fishnetPolys","0 0","0 1","1","1","1","1","#","NO_LABELS","#","POLYGON")
fcs = arcpy.SearchCursor("C:/Temp/test.gdb/fishnetPolys")
for fc in fcs:
print fc.Shape_Area
print "Above came from Shape_Area field of polygon on disk"
del fc,fcs
arcpy.CopyFeatures_management("C:/Temp/test.gdb/fishnetPolys","in_memory/fishnetPolysInMemory")
arcpy.CopyFeatures_management("in_memory/fishnetPolysInMemory","C:/Temp/test.gdb/fishnetPolysBackOnDisk")
fcs = arcpy.SearchCursor("C:/Temp/test.gdb/fishnetPolysBackOnDisk")
for fc in fcs:
print fc.Shape_Area
print "Above came from Shape_Area field of polygon copied from disk to in_memory and back to disk"
del fc,fcs
fcs = arcpy.SearchCursor("in_memory/fishnetPolysInMemory")
for fc in fcs:
print fc.Shape_Area
print "Above came from Shape_Area field of polygon copied from disk to in_memory - but you should see error trying to access it"
del fc,fcs>>> ================================ RESTART ================================
>>>
1.00024415553
Above came from Shape_Area field of polygon on disk
1.00024415553
Above came from Shape_Area field of polygon copied from disk to in_memory and back to disk
Traceback (most recent call last):
File "C:/Organisations/Qld DERM/SHAPE_Area_bug.py", line 31, in <module>
print fc.Shape_Area
File "C:\Program Files\ArcGIS\Desktop10.0\arcpy\arcpy\arcobjects\_base.py", line 25, in __getattr__
x = getattr(self._arc_object, attr)
RuntimeError: Row: Field Shape_Area does not exist
>>>Note: Background processing is not involved when I see this.
