Merge pull request #9100 from uranusjr/new-resolver-deterministic-ord…

…ering Tie-break requirements with package name
pypa · Nov 8, 2020 · ee7c56e · ee7c56e
2 parents 0512785 + 69a95cf
commit ee7c56e
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diff --git a/news/9100.feature.rst b/news/9100.feature.rst
@@ -0,0 +1 @@
+The new resolver now resolves packages in a deterministic order.
diff --git a/src/pip/_internal/resolution/resolvelib/provider.py b/src/pip/_internal/resolution/resolvelib/provider.py
@@ -57,7 +57,8 @@ def get_preference(
     ):
         # type: (...) -> Any
         transitive = all(parent is not None for _, parent in information)
-        return (transitive, bool(candidates))
+        key = next(iter(candidates)).name if candidates else ""
+        return (transitive, key)
 
     def find_matches(self, requirements):
         # type: (Sequence[Requirement]) -> Iterable[Candidate]