Nick Coghlan <ncogh...@gmail.com> added the comment:

The generalist in me is inclined to suggest a "depth" parameter (with depth=1 
equivalent to direct dependencies only, and depth = None meaning all 
dependencies), but I must admit I don't have a concrete use case for the extra 
generality. So the simpler, recurse/don't recurse approach is probably a better 
option (building a depth-limited search on top of the recursion flag wouldn't 
be difficult anyway).

Aside from missing docs and unit test updates, the idea seems sound.

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<http://bugs.python.org/issue1284670>
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