How do I force a single instance of a python app?

[Joshua Muskovitz]

"Dale Strickland-Clark" <dale at out-think.NOSPAMco.uk> wrote in message
news:urodvssp7e7cmbv1ljlqnqgej9rjhfqbli at 4ax.com...
> Open a flag file exclusively for writing. If successful you are alone,
> if not, another instance already has the file.
>
> The OS should close the file and free the exclusive lock if the app
> crashes.

This would be great, but on my Win2k box, I can open up the same file for
write in two separate Python instances at the same time.  :-(

The second instance of open("foo","w") does not fail.

-- josh




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