Remove unused Resolver.session

src/pip/_internal/cli/req_command.py

@@ -173,7 +173,6 @@ class RequirementCommand(IndexGroupCommand):
     @staticmethod
     def make_resolver(
         preparer,                            # type: RequirementPreparer
-        session,                             # type: PipSession
         finder,                              # type: PackageFinder
         options,                             # type: Values
         wheel_cache=None,                    # type: Optional[WheelCache]
@@ -197,7 +196,6 @@ class RequirementCommand(IndexGroupCommand):
         )
         return Resolver(
             preparer=preparer,
-            session=session,
             finder=finder,
             make_install_req=make_install_req,
             use_user_site=use_user_site,

src/pip/_internal/commands/download.py

@@ -136,7 +136,6 @@ class DownloadCommand(RequirementCommand):
             resolver = self.make_resolver(
                 preparer=preparer,
                 finder=finder,
-                session=session,
                 options=options,
                 py_version_info=options.python_version,
             )

src/pip/_internal/commands/install.py

@@ -369,7 +369,6 @@ class InstallCommand(RequirementCommand):
                 resolver = self.make_resolver(
                     preparer=preparer,
                     finder=finder,
-                    session=session,
                     options=options,
                     wheel_cache=wheel_cache,
                     use_user_site=options.use_user_site,

src/pip/_internal/commands/wheel.py

@@ -180,7 +180,6 @@ class WheelCommand(RequirementCommand):
                 resolver = self.make_resolver(
                     preparer=preparer,
                     finder=finder,
-                    session=session,
                     options=options,
                     wheel_cache=wheel_cache,
                     ignore_requires_python=options.ignore_requires_python,

src/pip/_internal/legacy_resolve.py

@@ -45,7 +45,6 @@ if MYPY_CHECK_RUNNING:
     from pip._vendor import pkg_resources
 
     from pip._internal.distributions import AbstractDistribution
-    from pip._internal.network.session import PipSession
     from pip._internal.index.package_finder import PackageFinder
     from pip._internal.operations.prepare import RequirementPreparer
     from pip._internal.req.req_install import InstallRequirement
@@ -116,7 +115,6 @@ class Resolver(object):
     def __init__(
         self,
         preparer,  # type: RequirementPreparer
-        session,  # type: PipSession
         finder,  # type: PackageFinder
         make_install_req,  # type: InstallRequirementProvider
         use_user_site,  # type: bool
@@ -141,7 +139,6 @@ class Resolver(object):
 
         self.preparer = preparer
         self.finder = finder
-        self.session = session
 
         self.require_hashes_option = require_hashes
 

tests/unit/test_req.py

@@ -86,7 +86,7 @@ class TestRequirementSet(object):
         return Resolver(
             preparer=preparer,
             make_install_req=make_install_req,
-            session=PipSession(), finder=finder,
+            finder=finder,
             use_user_site=False, upgrade_strategy="to-satisfy-only",
             ignore_dependencies=False, ignore_installed=False,
             ignore_requires_python=False, force_reinstall=False,