@ThomasH : another brick to the wall.
On unix systems, you have to ensure that parent directory is writeable too.
Here is another version :
def remove_readonly(func, path, exc):
excvalue = exc[1]
if func in (os.rmdir, os.remove) and excvalue.errno == errno.EACCES:
# ensure parent directory is writeable too
pardir = os.path.abspath(os.path.join(path, os.path.pardir))
if not os.access(pardir, os.W_OK):
os.chmod(pardir, stat.S_IRWXU| stat.S_IRWXG| stat.S_IRWXO)
os.chmod(path, stat.S_IRWXU| stat.S_IRWXG| stat.S_IRWXO) # 0777
func(path)
else:
raise