Fix extra incorrectly shown on installation error

news/13618.bugfix.rst

@@ -0,0 +1,2 @@
+When installing packages, pip will no longer show a misleading
+error message that included extra markers such as ``; extra == "..."``.

src/pip/_internal/index/package_finder.py

@@ -1014,16 +1014,19 @@ def _format_versions(cand_iter: Iterable[InstallationCandidate]) -> str:
                 )
                 if allows_pre is False:
                     version_type = "final version"
-
+            # pip sometimes includes environment markers like `;extra == "foo"`
+            # in requirement strings, which is confusing in error messages.
+            # Strip them so the user sees only the actual missing requirement.
+            req_disp = re.sub(r';\s*extra\s*==\s*".*?"', "", str(req)).strip()
             logger.critical(
                 "Could not find a %s that satisfies the requirement %s "
                 "(from versions: %s)",
                 version_type,
-                req,
+                req_disp,
                 _format_versions(best_candidate_result.all_candidates),
             )
 
-            raise DistributionNotFound(f"No matching distribution found for {req}")
+            raise DistributionNotFound(f"No matching distribution found for {req_disp}")
 
         def _should_install_candidate(
             candidate: InstallationCandidate | None,

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

@@ -4,6 +4,7 @@
 import copy
 import functools
 import logging
+import re
 from collections.abc import Callable, Iterable, Iterator, Mapping, Sequence
 from typing import (
     TYPE_CHECKING,
@@ -724,7 +725,7 @@ def _report_single_requirement_conflict(
             req_disp = str(req)
         else:
             req_disp = f"{req} (from {parent.name})"
-
+        req_disp = re.sub(r';\s*extra\s*==\s*".*?"', "", req_disp).strip()
         cands = self._finder.find_all_candidates(req.project_name)
         skipped_by_requires_python = self._finder.requires_python_skipped_reasons()
 
@@ -776,8 +777,7 @@ def _report_single_requirement_conflict(
                 "using the '-r' flag to install the packages listed in "
                 "requirements.txt"
             )
-
-        return DistributionNotFound(f"No matching distribution found for {req}")
+        return DistributionNotFound(f"No matching distribution found for {req_disp}")
 
     def _has_any_candidates(self, project_name: str) -> bool:
         """

tests/functional/test_install_extras.py

@@ -189,6 +189,10 @@ def test_install_special_extra(
     assert (
         "Could not find a version that satisfies the requirement missing_pkg"
     ) in result.stderr, str(result)
+    assert "No matching distribution found for missing_pkg" in result.stderr, str(
+        result
+    )
+    assert "extra ==" not in result.stderr, str(result)
 
 
 @pytest.mark.network