[issue17005] Add a topological sort algorithm

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I think 'toposort' is a good name for a function that implements 'topological sorting'.
https://en.wikipedia.org/wiki/Topological_sorting

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versions: +Python 3.8 -Python 3.4

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