socket.fromfd()'s behaviour is somewhat counter-intutive and should contain a note to warn the user that it'll leave the original FD open. This is important if someone forgets to manually close the file descriptor as it might lead to FD leaks (and kernel memory leaks). This is especially the case when there is no python object associated with the FD, so no destruction will take place.

patch applies to this:
http://docs.python.org/py3k/archives/python-3.1.2-docs-html.tar.bz2

The only thing it does is that it adds a note section with the following message: "The original file descriptor will not be closed."

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