I'm trying to automate the conversion of raster to polygon and the raster files are in "TIF" format which is a "floating point". I copy the code below from raster to polygon conversion so it needs some changes because of "unsigned integer" and ...that I don't know.

How can I correct this code?

I'm getting an error while executing it.

Runtime error Traceback (most recent call last): File "", line 18, in TypeError: 'NoneType' object is not iterable

Code

import arcpy, os
from arcpy import env
from arcpy.sa import *

#To overwrite output
arcpy.env.overwriteOutput = True

#Set environment settings
env.workspace = "K:\1400-10-20"

outws="K:\1400-10-20\m"

#checkout ArcGIS spatial analyst extension license
arcpy.CheckOutExtension("Spatial")

inraster = arcpy.ListRasters("*", "TIF")

for i in inraster:
    filename=os.path.splitext(i)[0]
    outPolygons= outws + str(filename) + '.shape'
    field = "VALUE"
    arcpy.RasterToPolygon_conversion(i, outPolygons, "NO_SIMPLIFY", field)