[issue17005] Add a topological sort algorithm

[Raymond Hettinger]

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

At some point in the next two or three weeks, I'll have a chance to work on this more and to offer a competing patch.  IMO, the current checkin is over-engineered, both in its API and implementation.  This could have been a simple, fast tool written as one or two short Python functions.

Also, I would like to try to out the API alternatives on some groups of engineers to get some user feedback.

For me, as the API currently stands, I would have to write a wrapper to make it usable for my applications.

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