import os, sys, traceback, arcgisscripting
gp = arcgisscripting.create()

try:
##    input_files = ['C:\Gary_stuff\Class_Partition\Class_Problem\Partition1.pnn',
##                   'C:\Gary_Stuff\Class_Partition\Class_Problem\Partion2.pnn']
    input_files = gp.GetParameterAsText(0).split(';')
##    output_file = 'C:\Gary_Stuff\Class_Partition\Class_Problem\NNOutput.pnn'
    output_file = gp.GetParameterAsText(1)
    fdout = open(output_file,'w')
    row_id = 1
    for input_file in input_files:
        fdin = open(input_file,'r')
        print 'processing partition %s...'%(fdin.name)
        gp.addmessage( 'processing partition %s...'%fdin.name)
        for line in fdin:
            items = line.split(',')
            items[0] = str(row_id)
            row_id += 1
            outline = ','.join(items)
            fdout.write(outline)
        fdin.close()
    fdout.close()
        
except Exception, msg:
   # get the traceback object
    tb = sys.exc_info()[2]
    # tbinfo contains the line number that the code failed on and the code from that line
    tbinfo = traceback.format_tb(tb)[0]
    # concatenate information together concerning the error into a message string
    pymsg = "PYTHON ERRORS:\nTraceback Info:\n" + tbinfo + "\nError Info:\n    " + \
        str(sys.exc_type)+ ": " + str(sys.exc_value) + "\n"
    # generate a message string for any geoprocessing tool errors
    msgs = "GP ERRORS:\n" + gp.GetMessages(2) + "\n"
    gp.AddError(msgs)

    # return gp messages for use with a script tool
    gp.AddError(pymsg)

    # print messages for use in Python/PythonWin
    print pymsg
    print msgs
    raise