STINNER Victor <vstin...@python.org> added the comment:
PyFunction_Type.tp_clear changed in bpo-33418 (previously, it was equal to 0:
no clear method):
commit 3c452404ae178b742967589a0bb4a5ec768d76e0
Author: INADA Naoki <meth...@users.noreply.github.com>
Date: Wed Jul 4 11:15:50 2018 +0900
bpo-33418: Add tp_clear for function object (GH-8058)
Without tp_clear, GC can't break cyclic reference.
It will cause memory leak when cyclic reference is
created intentionally.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38006>
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