Thank you, Tim. The portalocker code seems to prevent reading while the file is locked for writing, but it doesn't seem to prevent multiple writes (nor multiple exclusive locks, for that matter).
I guess it'd be better if I use the second suggestion, i.e. temporarily renaming the file for writing, and renaming it back to unlock it. Cheers, g "Tim Golden" <[EMAIL PROTECTED]> schreef in bericht news:[EMAIL PROTECTED] Might be worth looking in the Python Cookbook area. I seem to remember several recipes to do this kind of thing cross-platform. eg, http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65203 Also the pywin32 docs come with a flock-style example. Hope one of the two can help you. TJG -- http://mail.python.org/mailman/listinfo/python-list
