Creating a python scrip to batch process .dat files

Discussion created by CyanBC on Apr 9, 2013
Latest reply on Apr 12, 2013 by philmorefield
I have been trying to create a python scrip to batch process .dat files (with .hdr files).

The data is PRISM Temperature, Precip etc... data which are stored as .dat files - for all the type of functions I need, ArcGIS spatial analyst tools can do it if I do them 1-by-1. I have 3,100 files that need processing. This is what I need to happen

Mask the PRISM data to the study area.
Convert PRISM .dat to ASCII

I tried adapting the code I found below

# Extracts the cells of a raster that correspond with the areas
# defined by a mask.
# Author: Michel
# Date: 10 de Janeiro de 2011
# -----------------------------

# Import system modules
import sys, string, os, arcgisscripting

# Create the Geoprocessor object
gp = arcgisscripting.create()

    # Check out any necessary licenses

    # Load required toolboxes...
    gp.AddToolbox("C:/Program Files (x86)/ArcGIS/Desktop10.0/ArcToolbox/Toolboxes/Spatial Analyst Tools.tbx")

    gp.workspace = "C:/Users/ken/Desktop/GIS Model/FinalProjectData/PRISM_Binary/test"
    out_workspace = "C:/Users/ken/Desktop/GIS Model/FinalProjectData/PRISMPrecip"
    mask = "C:/Users/ken/Desktop/GIS Model/FinalProjectData/PolygonStudyArea/polygonstudyarea.shp"

    # Get a list of the rasters in the workspace
    raster = gp.ListRaster()

    # Loop through the list of rasters
    raster =

    while raster:
        # Set the outputname for each output to be the same as the input
        output = out_workspace + raster

        # Process: Extract by Mask...
        gp.ExtractByMask_sa(raster, mask, output)

        # Loop function...
        raster =

    # If an error occurred while running a tool, then print the messages.
    print "Error in script"
    print gp.GetMessages()

But I've read that the tool in python has a known error that won't process .dat
The python code I cobbled clumsily together for mass converting to ASCII had no luck
# Description: Converts a raster datasets to an ASCII file representing 
#    raster data from a foler.  
# Requirements: arcpy
# Author: Kenneth

# Import system modules
import arcpy
from arcpy import env

# Set environment settings
    env.workspace = "C:/Users/ken/Desktop/GIS Model/FinalProjectData/PRISM_Binary/test"
    out_workspace = "C:/Users/ken/Desktop/GIS Model/FinalProjectData/PRISMPrecip"

# Set local variables
    raster = env.ListRaster()

#loop through raster list
    raster =

    while raster:
        #set output name for each to be same as input
        outASCII = out_workspace + rasterlist
        # Execute RasterToASCII
        arcpy.RasterToASCII_conversion(raster, outASCII)

        #loop function
        raster =
    # If an error occurred while running a tool, then print the messages.
    print "Error in script"

Is there any other way I can mass change these files? I appreciate any help.