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Thu Jul 15 15:17:48 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-July/046247.html

> Almost all tp_traverse implementations can (and should) look exactly
> alike:
> 
> Py_VISIT(member1);
> Py_VISIT(member2);
> ...
> Py_VISIT(member_n);
> return 0;

It does get a little more complicated for containers that loop over
their contents and possibly have other PyObject * fields also.

Still, I applied the macro to collections and itertools and found it to
be straight-forward and easy to use.

Raymond

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