Lazy-evaluate `is_satisfied_by`
uranusjr opened this issue · comments
Context: pypa/pip#7966 (comment)
I think it is theoratically possible for the resolver to not process the candidate list immediately, but to simply add a “filter” thing on it, and check is_satisfied_by on a candidate only if it ever needs it (because all candidates with higher preferences don’t work). This would probably make the things a lot of complex than they are right now, but it sounds like a good thing for performance as well.
c/f pypa/pip#8023
We went a different route instead, by making find_matches() return a lazy sequence.