[issue17005] Add a topological sort algorithm

[Jim Fasarakis-Hilliard]

Jim Fasarakis-Hilliard <d.f.hilliard at gmail.com> added the comment:

It does seem out of place in functools, intensified by it's odd interjection among the other functools objects.

Considering heapq and bisect exist as standalone modules, the idea that topological sorting could go in its own module wouldn't be without precedent.

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nosy: +Jim Fasarakis-Hilliard

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<https://bugs.python.org/issue17005>
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