[issue24221] Clean-up and optimization for heapq siftup() and siftdown()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Perhaps the code will look simpler if introduce the macro _PyList_SWAP_ITEMS(list, i, j).

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24221>
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