Simple python script to write .hidden files to hide all the annoying .pyc files in a project directory

hidepyc.py

#!/usr/bin/env python

#  Copyright (c) 2017 Kurt Jacobson
#  License: https://kcj.mit-license.org/@2017

import os
import sys
import mimetypes

try:
    walk_dir = sys.argv[1]
except IndexError:
    print "First argument must be either a relitive or absolute path"
    print 'Ex: $ hide-pyc.py .  will hide all .pyc in the current dir and its subdirs'
    print 'You can simulate by adding the argument "-s"'
    print 'Ex: $ hide-pyc.py <PATH> -s'
    sys.exit()

try:
    if sys.argv[2]:
        simulate = True
except IndexError:
    simulate = False

if not os.path.exists(walk_dir):
    print('The directory "{}" does not exist'.format(walk_dir))
    sys.exit()

print('Hiding .pyc files in "{}" and its subdirectories'.format(walk_dir))

files_witten = 0
files_hidden = 0

for root, subdirs, files in os.walk(walk_dir):
    if root.startswith(os.path.join(walk_dir, '.git')):
        continue

    dot_hidden_path = os.path.join(root, '.hidden')

    files_to_hide = []

    for filename in files:
        if mimetypes.guess_type(filename)[0] == 'text/x-python':
            files_to_hide.append(filename)

    if files_to_hide:

        print('\nDirectory: {}'.format(root))

        file_content = ''
        for file_name in sorted(files_to_hide):
            files_hidden += 1
            file_content += file_name + 'c\n'
            print('\t ' + file_name + 'c')

        files_witten += 1
        if not simulate:
            with open(dot_hidden_path, 'wb') as list_file:
                list_file.write(file_content)

if simulate:
    print('\n{} .hidden files can be written hiding a total of {} .pyc files.' \
        '\nNo changes have been made.'.format(files_witten, files_hidden))
else:
    print('\n{} .hidden files have been written hiding a total of {} .pyc files.'
        .format(files_witten, files_hidden))

please explain by commenting, I dont understand it