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Showing content from https://mail.python.org/pipermail/python-dev/2006-April/063427.html below:

[Python-Dev] reference leaks, __del__, and annotations

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[Greg Ewing]
> That's really what I'm asking -- what *does* a
> generator finaliser need to reference? Or does
> it depend on what the generator's code does?

A generator finalizer can execute arbitrary Python code.  Note that
even if that was limited (which it isn't -- there are no limitations)
to executing "pass", it wouldn't be exploitable, because the GIL can
be released during any Python code, allowing other threads to run
anything before the finalizer returns.

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