[issue17005] Add a topological sort algorithm

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

Any suggestions for the new module? I assume we can move this to a new topsort/topological_sort or similar...

What do people think?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17005>
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