[issue28959] Add a macro for dict size

[STINNER Victor]

STINNER Victor added the comment:

> Should we use Py_SIZE or _PyDict_GET_SIZE?

I prefer _PyDict_GET_SIZE() just to make the code more readable: it helps to repeat the type of variables.

Moreover, it can give you a free check on the type if you agree my suggestion to add an assertion into the macro directly.

Technically, it's already possible to use Py_SIZE() on lists and tuples, but PyTuple_GET_SIZE() and PyList_GET_SIZE() are used almost everywhere, again, for readability.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28959>
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