[issue23493] optimize sort_keys in json module by using operator.itemgetter()

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

In C version, we don't use key func.

    items = PyMapping_Items(dct);
    if (items == NULL)
        goto bail;
    if (s->sort_keys && PyList_Sort(items) < 0) {

Like that, how about removing key function completely?

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nosy: +inada.naoki

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23493>
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