I am facing this error time and again when I am try to read my img rasters and running a conditional statement. I am new to Python. The code ran for one raster that is without for loop but not later. Here is the code:

import arcpy, os
from arcpy import env
from arcpy.sa import *
env.overwriteOutput = True
arcpy.env.workspace = r"C:\Users\libpub\Desktop\try"

rasterlist = arcpy.ListRasters()
for raster in rasterlist:
    out1 = Con(('Raster')>0.2, 1, 0)
    print out1

print "done!"
  • 1
    welcome to GIS SE! Please use this guide to indent block you code: meta.stackexchange.com/questions/22186/… Also, please post the exact error message you are receiving.
    – NULL.Dude
    Dec 14, 2017 at 13:56
  • 1
    Add an r to the path out1.save(r"...
    – BERA
    Dec 14, 2017 at 14:13

1 Answer 1


The arcpy.ListRasters function returns a list of the raster names in your workspace. The Con function, in the format you are using, requires an input Raster object which can be created with:

rast = Raster('raster_name')

If you change out1 = Con(('Raster')>0.2, 1, 0) to out1 = Con(Raster(raster)>0.2, 1, 0) you should find it works. This is shown in the Con documentation in code example 1.


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