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New resolver try user requested combinations first #8924

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merged 3 commits into from
Sep 29, 2020
Merged

New resolver try user requested combinations first #8924

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ebc1375
Make private attribute looks private
uranusjr Sep 26, 2020
c2de897
Resolve user-requested requirements first
uranusjr Sep 27, 2020
df6d3c7
News fragment
uranusjr Sep 28, 2020
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2 changes: 2 additions & 0 deletions news/8924.feature
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
New resolver: Tweak resolution logic to improve user experience when
user-supplied requirements conflict.
17 changes: 12 additions & 5 deletions src/pip/_internal/resolution/resolvelib/provider.py
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Expand Up @@ -43,7 +43,7 @@ def __init__(
self._constraints = constraints
self._ignore_dependencies = ignore_dependencies
self._upgrade_strategy = upgrade_strategy
self.user_requested = user_requested
self._user_requested = user_requested

def _sort_matches(self, matches):
# type: (Iterable[Candidate]) -> Sequence[Candidate]
Expand Down Expand Up @@ -84,7 +84,7 @@ def _eligible_for_upgrade(name):
if self._upgrade_strategy == "eager":
return True
elif self._upgrade_strategy == "only-if-needed":
return (name in self.user_requested)
return (name in self._user_requested)
return False

def sort_key(c):
Expand Down Expand Up @@ -115,11 +115,18 @@ def get_preference(
self,
resolution, # type: Optional[Candidate]
candidates, # type: Sequence[Candidate]
information # type: Sequence[Tuple[Requirement, Candidate]]
information # type: Sequence[Tuple[Requirement, Optional[Candidate]]]
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Part of me wonders if we could call this something else, since "information" is too generic. OTOH, dependency_information seems even worse tho. ('.')

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information is what resolvelib calls it. Agreed that a better name might be nice, but let's leave that as a resolvelib question :-)

):
# type: (...) -> Any
# Use the "usual" value for now
return len(candidates)
"""Return a sort key to determine what dependency to look next.

A smaller value makes a dependency higher priority. We put direct
(user-requested) dependencies first since they may contain useful
user-specified version ranges. Users tend to expect us to catch
problems in them early as well.
"""
transitive = all(parent is not None for _, parent in information)
return (transitive, len(candidates))

def find_matches(self, requirements):
# type: (Sequence[Requirement]) -> Iterable[Candidate]
Expand Down