#!/usr/bin/env python

from __future__ import unicode_literals, print_function

import os
import sys

keep_same = [
    # Add the file types here you don't want to change.
    '.zip', '.tar',
]

if len(sys.argv) < 2:
    print('provide path')

for d in sys.argv[1:]:
    if os.path.isdir(d):
        for root, dirs, files in os.walk(d):
            for fn in files:
                if not any(fn.endswith(ext) for ext in keep_same):
                    s = os.path.join(root, fn)
                    os.rename(s, s + '.txt')