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Sat Oct 30 20:39:35 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-October/105092.html

On Fri, Oct 29, 2010 at 8:35 PM, Brett Cannon <brett at python.org> wrote:
> For those of you who have not noticed, Antoine committed a patch that
> raises a ResourceWarning under a pydebug build if a file or socket is
> closed through garbage collection instead of being explicitly closed.

Just yesterday I discovered /proc/<your PID here>/fd/ which is a list
of open file descriptors for your PID on *nix and includes all open
files, pipes, and sockets.  Very handy, I filed some tickets about
company internal libs that were opening file handles as a side effect
of import (logging mostly).  I tried to provoke standard python
imports (non-test) to leave some open handles and came up empty.

-Jack

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[Python-Dev] closing files and sockets in a timely manner in the stdlib