topic Re: Problem Executing Loop in Python Questions

Problem Executing Loop

JohanOldekop — Fri, 23 Sep 2011 10:20:13 GMT

Hello,

New to python and writing my first scripts. I am trying to build a loop to generate individual polygon shapefiles from a feature layer which contains a whole series of polygons. Here's the script, which doesn't seem to work as well as the error message. I'd be grateful if anyone has any suggestions...

cheers,

Johan

Import Phython functions
import arcpy
from arcpy import env
from arcpy.sa import *

env.workspace = "C:/GTZ Data/PEN_IUCN/PEN_IUCN"

InShapefile = "C:/IUCN Data/AMPHANURA/AMPHANURA_RBS_Clip.shp"

try:
rows = arcpy.SearchCursor (InShapefile)
row = rows.next()

while row:
id= row.getValue ("FID")
outFC=id + ".shp"
sel = str('"FID" = ' " ' "+id+" ' ")

arcpy.Select_analysis(InShapefile, OutFC, sel)
row = rows.next()

except:

arcpy.AddMessage(arcpy.GetMessages(2))
print arcpy.GetMessages(2)

Parsing error <type 'exceptions.IndentationError'>: expected an indented block (line 2)

Re: Problem Executing Loop

VeraDiaz-Köhli — Fri, 23 Sep 2011 10:44:49 GMT

joldekop;136108 wrote:

.....
while row:
   id= row.getValue ("FID")
   outFC=id + ".shp"
   sel = str('"FID" = ' " ' "+id+" ' ")

   arcpy.Select_analysis(InShapefile, OutFC, sel)
   row = rows.next()

>> indent block 2! (after while row:)

I'm using "Pyscripter" to write my scripts. If you forget to indent code there, it's marked as an error.

Re: Problem Executing Loop

Luke_Pinner — Fri, 23 Sep 2011 13:46:20 GMT

Please wrap your script in code tags so the indentation is preserved. Especially when your problem IS with indentation...

I had a look at the page source. You don't have an indented block after the except clause:

Re: Problem Executing Loop

JamesHood — Fri, 23 Sep 2011 20:23:00 GMT

Hello,

New to python and writing my first scripts. I am trying to build a loop to generate individual polygon shapefiles from a feature layer which contains a whole series of polygons. Here's the script, which doesn't seem to work as well as the error message. I'd be grateful if anyone has any suggestions...

cheers,

Johan

Import Phython functions
import arcpy
from arcpy import env
from arcpy.sa import *

env.workspace = "C:/GTZ Data/PEN_IUCN/PEN_IUCN"

InShapefile = "C:/IUCN Data/AMPHANURA/AMPHANURA_RBS_Clip.shp"

try:
rows = arcpy.SearchCursor (InShapefile)
row = rows.next()

while row:
id= row.getValue ("FID")
outFC=id + ".shp"
sel = str('"FID" = ' " ' "+id+" ' ")

arcpy.Select_analysis(InShapefile, OutFC, sel)
row = rows.next()

except:

arcpy.AddMessage(arcpy.GetMessages(2))
print arcpy.GetMessages(2)

Parsing error <type 'exceptions.IndentationError'>: expected an indented block (line 2)

Note also that you are creating shapefiles that will be numeric.shp... starting a shapefile with a number generally makes ArcMap sad.

Try also:
id= row.getValue ("FID")
outFC="shape_" + str(id) + ".shp"
sel = str('"FID" = ' " ' "+id+" ' ")

Re: Problem Executing Loop

MichaelStead — Fri, 23 Sep 2011 21:08:30 GMT

Arcmap is moody in general, somedays it might smile at numeric.shp.....

What is that first line anyways? "Import Phython Functions"