[issue17005] Add a topological sort algorithm

[Pablo Galindo Salgado]

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

If we move it, I would prefer a new module that somehow makes clear the scope, something like graphutils or graphtheory or graph (although this las one will probably collide with many existing things).

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