[issue17005] Add a topological sort algorithm

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Unless Łukasz gives us a nod to work out this API for the second beta, we'll need to defer this to 3.9.   IMO, the API in the patch is not user friendly.  It started on the right path but became contorted (for both inputs and outputs) to serve unusual cases.

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nosy: +lukasz.langa

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