Petr Viktorin added the comment:
tp_traverse is completely orthogonal to tp_dealloc, it's needed to detect (and
then break) reference cycles like:
obj = xxlimited.Xxo()
obj.foo = obj
As for tp_finalize: yes, mentioning it in tp_dealloc docs would be good, but
I'll need a bit more studying to understand the problem correctly. The cases
fixed here are relatively simple; Antoine gives more complex ones in [0]. When
I feel qualified to give advice, I'll change the docs. (And most likely, write
a PEP to make things easier; some changes to classes will be needed anyway to
make PEP 489 multi-phase init work nicely in all cases).
But, I plan to focus my CPython time on documenting PEP 489 before diving in
here. I think issue 16690 is a good place to track tp_dealloc docs changes.
[0] https://mail.python.org/pipermail/python-dev/2015-June/140423.html
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