[issue477863] Print warning at shutdown if gc.garbage not empty

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> - use test.script_helper.run_python rather than rolling your own
> run_command (or, at least, just make run_command a thin wrapper around
> run_python). I've been trying to trim down the number of different
> ways the test suite launches interpreter subprocesses for testing
> purposes, and script_helper also does a bit of extra cleanup to try to
> eliminate false alarms regarding reference leaks.

After a quick grep, it seems script_helper is really in the minority
(it's only used in three test files) while ad hoc calls to subprocess
with sys.executable are all over the place. I'd rather open a separate
feature request for that new script_helper function than convert all
uses of subprocess in this issue.

> - update the description of gc.DEBUG_UNCOLLECTABLE in the docs to
> specifically mention that the complete list of uncollectable objects
> will also be printed at interpreter shutdown.

Ah, indeed. Thanks!

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<http://bugs.python.org/issue477863>
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