Delete file with read-only permission, but write permission to parent folder

[cubei]

In case someone is interested in my solution for copying a file and overwriting it in case it is already available:

import os
import shutil
import filecmp
import stat

def copyFile(sourceFile, destinationFile):
  if not os.path.isfile(destinationFile) or not filecmp.cmp(sourceFile, destinationFile):
    if os.path.isfile(destinationFile):
      os.chmod(destinationFile, stat.S_IWRITE) # Make sure the file is not read-only
    shutil.copyfile(sourceFile, destinationFile)