I'm trying to build a script that uses select by attribute and select by location to do some operations on a couple of shapefiles containing a large amount of points and polygons. Preferably, I want to make it runnable without adding any files to Arcmap, but I can´t get Select by Attribute to work and I don´t understand why. Here´s an example:
arcpy.env.workspace = "C:/Projekt\Mitt_skolval/Test_adresser_skolor/" fcs = arcpy.ListFeatureClasses() print(fcs)
[u'Adresser_18dec2020.shp', u'Skolskjutsomraden_4_5_2021.shp', u'Skolskjutsomraden_6_2021.shp', u'Skolskjutsomraden_7_9_2021.shp', u'Skolskjutsomraden_F_3_2021.shp']
If I then try this:
adresser = fcs arcpy.SelectLayerByAttribute_management(adresser, "NEW_SELECTION", "FID = 3")
It throws this error:
Runtime error Traceback (most recent call last): File "<string>", line 9, in <module> File "c:\program files (x86)\arcgis\desktop10.8\arcpy\arcpy\management.py", line 7759, in SelectLayerByAttribute raise e ExecuteError: The value cannot be a feature class ERROR 000840: The value is not a Raster Layer. ERROR 000840: The value is not a Mosaic Layer.
Saying from what I understand that I can´t use Select by attribute on a shapefile, which is weird. HOWEVER, if I add the same shapefile to the ToC and run
arcpy.SelectLayerByAttribute_management(Adresser_18dec2020, "NEW_SELECTION", "FID = 3")
Why is this?
I know I can solve this by creating feature layers, but I want to avoid this if possible.