AlreadyInstalledCandidate

src/pip/_internal/resolution/resolvelib/candidates.py

@@ -154,7 +154,7 @@ class LinkCandidate(Candidate):
         return self._ireq
 
 
-class InstalledCandidate(Candidate):
+class AlreadyInstalledCandidate(Candidate):
     def __init__(
         self,
         dist,  # type: Distribution
@@ -219,8 +219,12 @@ class ExtrasCandidate(Candidate):
     version 2.0. Having those candidates depend on foo=1.0 and foo=2.0
     respectively forces the resolver to recognise that this is a conflict.
     """
-    def __init__(self, base, extras):
-        # type: (Union[InstalledCandidate, LinkCandidate], Set[str]) -> None
+    def __init__(
+        self,
+        base,  # type: Union[AlreadyInstalledCandidate, LinkCandidate]
+        extras,  # type: Set[str]
+    ):
+        # type: (...) -> None
         self.base = base
         self.extras = extras
 

src/pip/_internal/resolution/resolvelib/factory.py

@@ -7,8 +7,8 @@ from pip._vendor.pkg_resources import (
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
 
 from .candidates import (
+    AlreadyInstalledCandidate,
     ExtrasCandidate,
-    InstalledCandidate,
     LinkCandidate,
     RequiresPythonCandidate,
 )
@@ -60,7 +60,7 @@ class Factory(object):
         parent,  # type: InstallRequirement
     ):
         # type: (...) -> Candidate
-        base = InstalledCandidate(dist, parent, factory=self)
+        base = AlreadyInstalledCandidate(dist, parent, factory=self)
         if extras:
             return ExtrasCandidate(base, extras)
         return base