#!/usr/bin/env python3

"""Change permissions on a file

"""

#end_pymotw_header

import os

import stat

filename = 'os_stat_chmod_example.txt'

if os.path.exists(filename):

os.unlink(filename)

with open(filename, 'wt') as f:

f.write('contents')

# Determine what permissions are already set using stat

existing_permissions = stat.S_IMODE(os.stat(filename).st_mode)

if not os.access(filename, os.X_OK):

print('Adding execute permission')

new_permissions = existing_permissions | stat.S_IXUSR

else:

print('Removing execute permission')

# use xor to remove the user execute permission

new_permissions = existing_permissions ^ stat.S_IXUSR

os.chmod(filename, new_permissions)