OS independent way to check if a python app is running?

[python at bdurham.com]

Is there an os independent way to check if a python app is
running?

Goal: I have a server program based on cherrypy that I only want
to have running once. If a system administrator accidentally
attempts to run this program more than once, I would like the 2nd
instance of the program to detect that its already running and
exit.

Thank you,
Malcolm
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