[issue23971] dict(list) and dict.fromkeys() doesn't account for 2/3 fill ratio

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

-            if (dictresize(mp, Py_SIZE(seq))) {
+            if (dictresize(mp, Py_SIZE(seq) / 2 * 3)) {


If Py_SIZE(seq) is 1, dictresize argument is 0.

Why not wryte the expression as Py_SIZE(seq) * 3 / 2? It never overflows, because Py_SIZE(seq) is the size of allocated array of pointers.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23971>
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