A python script that iterates through all of the files in a given directory and runs the previous preproc() function on them.

postproc

import os

#get a list of the files in the current directory
a = os.listdir(os.getcwd())

def postproc(a):
#for every file in the directory
  for i in a:
#call the preproc function on said file and generate the appropriate outfile
    preproc(i, "out"+str(a.index(i))+".txt")