Read-only Windows files with Python

How do you use Python to get or change read-only/writeable access on files in Windows? The Python docs don't answer this in a direct manner. Here's one option using only the standard library.

import os, stat
myFile = r'C:\stuff\grail.txt'

fileAtt = os.stat(myFile)[0]
if (not fileAtt & stat.S_IWRITE):
   # File is read-only, so make it writeable
   os.chmod(myFile, stat.S_IWRITE)
else:
   # File is writeable, so make it read-only
   os.chmod(myFile, stat.S_IREAD)

You may prefer the pywin32 extensions for this sort of thing...

import win32api, win32con
myFile = r'C:\stuff\grail.txt'

fileAtt = win32api.GetFileAttributes(myFile)
if (fileAtt & win32con.FILE_ATTRIBUTE_READONLY):
   # File is read-only, so make it writeable
   win32api.SetFileAttributes(myFile, ~win32con.FILE_ATTRIBUTE_READONLY)
else:
   # File is writeable, so make it read-only
   win32api.SetFileAttributes(myFile, win32con.FILE_ATTRIBUTE_READONLY)

Or, more concisely with win32:

roAtt = win32api.GetFileAttributes(myFile) & win32con.FILE_ATTRIBUTE_READONLY
win32api.SetFileAttributes(myFile, ~roAtt)

Using win32 you can also set other Windows file attributes (unlike os.chmod), but read/write is usually all I care about.