import arcpy from arcpy import env from arcpy import sa from arcpy.sa import * arcpy.CheckOutExtension("Spatial") env.workspace = r"C:\DATA\DEM" lstRasters = arcpy.ListRasters("*") for raster in lstRasters: outSlope = Slope(raster, "DEGREE", .3048) outSlope.save(r"C:\DATA\DEM" + "\\" + str(raster) + "_slope.tif")