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Mon Oct 10 18:44:55 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-October/146640.html

Random832 wrote:
> Or is this a special kind of lock that you
> can "assert isn't locked" without locking it for yourself, and
> INCREF/DECREF does so?

I don't think that would work. It might be unlocked at
the moment you test it, but someone might lock it between
then and the following INCREF/DECREF.

Locking is like pregnancy -- you can't have just a
little bit of it. :-)

-- 
Greg

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[Python-Dev] PyWeakref_GetObject() borrows its reference from... whom?