inner_transpose.py

import os
import re
import string
import random
path = "path_to_folder_just_about_set_of_text_files"

word = re.compile("\w*")

for x,y,z in os.walk(path):
    for file in z:
        joined = os.path.join(x,file)
        if os.path.isfile(joined) and ".txt" in file and "innertrans" not in file:
          
            #Block to handle lousy non-unicode text
            fp = open(joined,'r')
            fpc = fp.read().decode("utf-8-sig",'ignore').encode("utf-8", "ignore")
            fp.close()
            fp = open(joined, 'w')
            fp.write(fpc)
            fp.close()

            out = ""
            with open(joined) as f:
                for line in f:
                    line_split = line.split(" ")
                    for i, l in enumerate(line_split):

                        if len(l) > 3 and re.match(word,l) and l[-1] not in string.punctuation:
                            b = l[0]
                            e = l[-1]
                            middle = l[1:-1]

                            middle = list(middle)
                            random.shuffle(middle)
                            middle = ''.join(middle)

                            line_split[i] = b + middle + e
                    out += ' '.join(line_split)

            print len(out), out[:25]
            new_filename = os.path.join(x, file.split(".")[0]+"-innertrans"+".txt")
            print new_filename
            with open( new_filename, 'w') as f2:
                f2.write(out)