topic Re: get feature extent error in Python Questions

get feature extent error

YinghaiKe — Thu, 04 Aug 2011 00:42:37 GMT

I was trying to follow an python script example of getting extent of features (Note "test.shp" is polygon feature)

________________________________________________________
import arcpy
from arcpy import env

env.workspace = "C:/Data/"

sCur = arcpy.SearchCursor("test.shp", "","","ID_1" )

# Fetch each feature from the cursor and examine the extent properties
#
for row in sCur:
    geom = row.shape
    ext = geom.extent # or row.Shape.extent
    print "Extent of feature:\nXMin: %f, YMin: %f, \nXMax: %f, YMax: %f" % \
             (ext.XMin,ext.YMin,ext.XMax,ext.YMax)
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The script stopped at "ext = geom.extent". The error message shows:
    ext = geom.extent
AttributeError: 'passthrough' object has no attribute 'extent'

I don't know how to fix it. Any idea? Thanks!

Re: get feature extent error

JakeSkinner — Thu, 04 Aug 2011 10:43:32 GMT

I believe the problem is with the Search cursor. You have:

sCur = arcpy.SearchCursor("test.shp", "","","ID_1")

When specifying "ID_1" you are limiting the search cursor to this specific field, but you are trying to query the "Shape" field's extent. I would recommend keeping this parameter empty, or including the ''Shape'' field. Ex:

sCur = arcpy.SearchCursor("test.shp", "","","ID_1; Shape")

sCur = arcpy.SearchCursor("test.shp")

Re: get feature extent error

YinghaiKe — Thu, 04 Aug 2011 16:29:14 GMT

Hi Jake, It works. Thank you very much!