topic Re: TypeError :Abstract Class in Python Questions

TypeError :Abstract Class

ScottShenberger — Thu, 01 Nov 2012 15:54:14 GMT

Good Day

I hope I am posting this in the right place. We are having problems with a line of code and we are not sure what is causing the problem. We are running a script that will create data driven pages in pdf form. The line of code that is causing the problem is as follows

  dfAsFeature = arcpy.Polygon(arcpy.Array([df.extent.lowerLeft, df.extent.lowerRight, df.extent.upperRight, df.extent.upperLeft]), df.spatialReference)
  arcpy.SelectLayerByLocation_management(gridLayer, "HAVE_THEIR_CENTER_IN", dfAsFeature, "", "NEW_SELECTION")

The dfAsFeature line always throws the TypeError:AbstractClass error. The odd part is, it works on ArcMap 10.0 but not 10.1. The 10.1 machine is using Python 2.7 while the 10.0 machine is running Python 2.6.

Thank You

Scott Shenberger
Tucson Water

Re: TypeError :Abstract Class

RichardDaniels — Tue, 24 Jun 2014 16:38:22 GMT

I don't know how to fix it, but before Python 2.6.x there was no explicit way to declare an abstract class. It changed with the abc (Abstract Base Class) module now available from the standard library in Python 2.7. I'm getting the same error with this line of code.

partGeom = arcpy.Geometry("polygon", arcpy.Array(trPoints))

The variable partGeom probably needs to be declared now...

Rich

Re: TypeError :Abstract Class

ChrisSnyder — Sat, 11 Dec 2021 13:30:44 GMT

Scott - Your code executes fine for me in v10.1 SP1 (selection is made correctly). Are you sure that the SR you are trying to assign to your df extent polygon is okay? Is it defined?

I have a layer in ArcMap TOC "County Bounadries", and this code executed correctly:

mxd = arcpy.mapping.MapDocument("CURRENT")
df = mxd.activeDataFrame
polyObj = arcpy.Polygon(arcpy.Array([df.extent.lowerLeft, df.extent.lowerRight, df.extent.upperRight, df.extent.upperLeft]), df.spatialReference)
arcpy.SelectLayerByLocation_management("County Boundaries", "INTERSECT", polyObj)

Re: TypeError :Abstract Class

ChrisSnyder — Tue, 24 Jun 2014 18:05:23 GMT

Ha - Didn't notice that the OP was almost 2 years old!

Issue was probably fixed with 10.1 SP1 I bet.