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Tue Feb 19 00:56:43 CET 2008 · https://mail.python.org/pipermail/python-dev/2008-February/076965.html

> That sucks.  Most Py_DECREF calls are probably okay but it's going
> to be hard to find the ones that are not.

Methinks that

egrep 'DECREF\([a-zA-Z0-9_]->[a-zA-Z0-9_]+\)' */*.c

gives a good overview - you should never DECREF a variable on heap.
In the trunk, this command finds 36 candidates. Now, some of them
are in tp_dealloc methods, so they shouldn't cause problems - but
it can't hurt to replace them with Py_CLEAR, either.

Regards,
Martin

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[Python-Dev] Py_CLEAR to avoid crashes