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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Sat, 2 May 2015 22:29:40 -0600
Subject: Re: Inner workings of this Python feature: Can a Python data structure reference itself?
To: Python <python-list@python.org>
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On Sat, May 2, 2015 at 7:57 PM, Tim Chase <python.list@tim.thechases.com> wrote:
> So it sounds like you have to request such a mark-and-sweep from
> the gc module.

You *can* request it. But as long as it hasn't been explicitly
disabled (by calling gc.disable()), the mark-and-sweep garbage
collection will also run automatically -- just not necessarily
immediately.