[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/tox/session/cmd/show_config.py

@@ -95,7 +95,7 @@ def print_key_value(is_colored: bool, key: str, value: str, multi_line: bool = F
 
 
 def print_conf(is_colored: bool, conf: ConfigSet, keys: Iterable[str]) -> None:  # noqa: FBT001
-    for key in keys if keys else conf:
+    for key in keys or conf:
         if key not in conf:
             continue
         key = conf.primary_key(key)  # noqa: PLW2901

src/tox/tox_env/python/pip/pip_install.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import logging
+import operator
 from collections import defaultdict
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Callable, Sequence
@@ -132,7 +133,7 @@ def _install_requirement_file(self, arguments: PythonDeps, section: str, of_type
             if not eq:  # pragma: no branch
                 if old is not None:
                     self._recreate_if_diff("install flag(s)", new_options, old["options"], lambda i: i)
-                    self._recreate_if_diff("constraint(s)", new_constraints, old["constraints"], lambda i: i[3:])
+                    self._recreate_if_diff("constraint(s)", new_constraints, old["constraints"], operator.itemgetter(slice(3, None)))
                     missing_requirement = set(old["requirements"]) - set(new_requirements)
                     if missing_requirement:
                         msg = f"requirements removed: {' '.join(missing_requirement)}"

src/tox/util/cpu.py

@@ -10,7 +10,7 @@ def auto_detect_cpus() -> int:
         n: int | None = multiprocessing.cpu_count()
     except NotImplementedError:
         n = None
-    return n if n else 1
+    return n or 1
 
 
 __all__ = ("auto_detect_cpus",)

tests/util/test_ci.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import operator
+
 import pytest
 
 from tox.util.ci import _ENV_VARS, is_ci  # noqa: PLC2701
@@ -22,7 +24,7 @@
         "TEAMCITY_VERSION": None,  # TeamCity
         "TRAVIS": "true",  # Travis CI
     }.items(),
-    ids=lambda v: v[0],
+    ids=operator.itemgetter(0),
 )
 def test_is_ci(env_var: tuple[str, str | None], monkeypatch: pytest.MonkeyPatch) -> None:
     for var in _ENV_VARS:
@@ -41,7 +43,7 @@ def test_is_ci(env_var: tuple[str, str | None], monkeypatch: pytest.MonkeyPatch)
         "GITHUB_ACTIONS": "",  # GitHub Actions
         "TRAVIS": "",  # Travis CI
     }.items(),
-    ids=lambda v: v[0],
+    ids=operator.itemgetter(0),
 )
 def test_is_ci_bad_set(env_var: tuple[str, str], monkeypatch: pytest.MonkeyPatch) -> None:
     for var in _ENV_VARS: