Ex

import sys, os, fnmatch, subprocess, shutil
from collections import defaultdict

def findFiles (path, filter):
    for root, dirs, files in os.walk(path):
        for file in fnmatch.filter(files, filter):
            yield os.path.join(root, file)



def main(argv):
    mainDirectory = argv[0]
    outFile = open('extract.txt', 'wt')

    print('Deleting object files...')
    for file in findFiles(mainDirectory, '*.obj'):
        os.remove(file)
    print('Deleting text files...')
    for file in findFiles(mainDirectory, '*.txt'):
        os.remove(file)

    for file in findFiles(mainDirectory, '*.tri'):
        if file[:-7] != "new.tri": # Ignore generated files
            outFile.write('Extracting ' + file + '\n')
            proc = subprocess.Popen(['TriExtractor.exe', file, '-q'])
            proc.wait()

if __name__ == "__main__":
   main(sys.argv[1:])