[issue17005] Add a topological sort algorithm

[Raymond Hettinger]

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

How about I post a PR so we can talk about something concrete.  Then you two can either fight it to its death or you can join me in making it is good as possible, hopefully the latter :-)

I am not happy with the current API but do accept that both of you are in satisfied with it.

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