topic Basic ?: Script to apply color map not working, need help in Python Questions

Basic ?: Script to apply color map not working, need help

MarkEllis — Mon, 13 Jun 2011 14:29:29 GMT

I lifted some script text out of the help documentation, but nothing happens when I run it in the python window. It appears that the list of rasters returns empty, as the script starts and then finishes in less than one second. I'm new to python, so am not even sure where to begin troubleshooting.

(See script posted in third reply, below)

Re: Basic ?: Script to apply color map not working, need help

MarkEllis — Mon, 13 Jun 2011 19:33:09 GMT

Going through the python window in ArcMap has only made this more confusing.

Going line by line, there are no errors until the 'for raster in rasterList' line -
F2 returns a parsing error "expected an indented block"

Edit script or clear and reload with an indent,
F2 returns a parsing error "unexpected indent"

Really? How does one fix this? The Help documentation is worthless for details like this, any guidance from a user would be appreciated.

Re: Basic ?: Script to apply color map not working, need help

DarrenWiens2 — Mon, 13 Jun 2011 19:47:40 GMT

If you post the code inside

 tags (see above the text box when posting), we can see your indentation (which is important in Python, btw).

Re: Basic ?: Script to apply color map not working, need help

MarkEllis — Sat, 11 Dec 2021 11:49:51 GMT

Reposted script with code tags...

## Add color map to DRGs
##====================================
import arcpy
from arcpy import env

 # Set workspace
arcpy.env.workspace = "Y:\base_data\State\IL\100k_DRGs"

 # Get list of grids
rasterList = arcpy.ListRasters("*", "GRID")

   for raster in rasterList:
      ## Add Colormap
      try:
     
          ##Assign colormap using clr file
          arcpy.AddColormap_management(raster, "#", "ISA_DRG.clr")
          print raster

      except:
          print "Add Colormap example failed."
          print arcpy.GetMessages()

Re: Basic ?: Script to apply color map not working, need help

DarrenWiens2 — Tue, 14 Jun 2011 14:58:19 GMT

The problem is that your "for" is indented. You only indent after the colon (ie. after the "for").

Re: Basic ?: Script to apply color map not working, need help

MarkEllis — Tue, 14 Jun 2011 15:34:52 GMT

Thanks for the tip! I also noted in documentation that the workspace path should contain / instead of \, as the latter is a line continuation character in python. The two changes together worked, it is now running.

Syntax is tricky for the beginner...