Python Change File Read-only status

#python how to change File Attributes (Read and Write)
#taken from http://techarttiki.blogspot.com/2008/08/read-only-windows-files-with-python.html

import os, stat
myFile = r'TestFile.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)