[ruff] Add ruff's check and autofix existing issues

pyproject.toml

@@ -133,6 +133,7 @@ select = [
     "F",  # pyflakes
     "I",  # isort
     "UP", # pyupgrade
+    "RUF", # ruff
     "W",  # pycodestyle
 ]
 ignore = [
@@ -156,6 +157,12 @@ ignore = [
     "D402", # First line should not be the function's signature
     "D404", # First word of the docstring should not be "This"
     "D415", # First line should end with a period, question mark, or exclamation point
+    # ruff ignore
+    "RUF001", # String contains ambiguous character
+    "RUF003", # Comment contains ambiguous character
+    "RUF005", # Consider `(x, *y)` instead of concatenation
+    "RUF012", # Mutable class attributes should be annotated with `typing.ClassVar`
+    "RUF015", # Prefer `next(iter(x))` over single element slice
 ]
 
 [tool.ruff.format]

src/_pytest/_code/code.py

@@ -1018,7 +1018,7 @@ class FormattedExcinfo:
             extraline: Optional[str] = (
                 "!!! Recursion error detected, but an error occurred locating the origin of recursion.\n"
                 "  The following exception happened when comparing locals in the stack frame:\n"
-                f"    {type(e).__name__}: {str(e)}\n"
+                f"    {type(e).__name__}: {e!s}\n"
                 f"  Displaying first and last {max_frames} stack frames out of {len(traceback)}."
             )
             # Type ignored because adding two instances of a List subtype

src/_pytest/_py/path.py

@@ -1105,9 +1105,7 @@ class LocalPath:
                 modname = self.purebasename
             spec = importlib.util.spec_from_file_location(modname, str(self))
             if spec is None or spec.loader is None:
-                raise ImportError(
-                    f"Can't find module {modname} at location {str(self)}"
-                )
+                raise ImportError(f"Can't find module {modname} at location {self!s}")
             mod = importlib.util.module_from_spec(spec)
             spec.loader.exec_module(mod)
             return mod

src/_pytest/compat.py

@@ -27,7 +27,7 @@ _S = TypeVar("_S")
 # https://www.python.org/dev/peps/pep-0484/#support-for-singleton-types-in-unions
 class NotSetType(enum.Enum):
     token = 0
-NOTSET: Final = NotSetType.token  # noqa: E305
+NOTSET: Final = NotSetType.token
 # fmt: on
 
 

src/_pytest/config/__init__.py

@@ -671,7 +671,7 @@ class PytestPluginManager(PluginManager):
                 if dirpath in path.parents or path == dirpath:
                     if mod in mods:
                         raise AssertionError(
-                            f"While trying to load conftest path {str(conftestpath)}, "
+                            f"While trying to load conftest path {conftestpath!s}, "
                             f"found that the module {mod} is already loaded with path {mod.__file__}. "
                             "This is not supposed to happen. Please report this issue to pytest."
                         )

src/_pytest/fixtures.py

@@ -1225,7 +1225,7 @@ def fixture(
 
 
 @overload
-def fixture(  # noqa: F811
+def fixture(
     fixture_function: None = ...,
     *,
     scope: "Union[_ScopeName, Callable[[str, Config], _ScopeName]]" = ...,
@@ -1239,7 +1239,7 @@ def fixture(  # noqa: F811
     ...
 
 
-def fixture(  # noqa: F811
+def fixture(
     fixture_function: Optional[FixtureFunction] = None,
     *,
     scope: "Union[_ScopeName, Callable[[str, Config], _ScopeName]]" = "function",
@@ -1673,7 +1673,7 @@ class FixtureManager:
         raise NotImplementedError()
 
     @overload
-    def parsefactories(  # noqa: F811
+    def parsefactories(
         self,
         node_or_obj: object,
         nodeid: Optional[str],
@@ -1682,7 +1682,7 @@ class FixtureManager:
     ) -> None:
         raise NotImplementedError()
 
-    def parsefactories(  # noqa: F811
+    def parsefactories(
         self,
         node_or_obj: Union[nodes.Node, object],
         nodeid: Union[str, NotSetType, None] = NOTSET,

src/_pytest/junitxml.py

@@ -375,7 +375,7 @@ def record_testsuite_property(request: FixtureRequest) -> Callable[[str, object]
 
     xml = request.config.stash.get(xml_key, None)
     if xml is not None:
-        record_func = xml.add_global_property  # noqa
+        record_func = xml.add_global_property
     return record_func
 
 

src/_pytest/main.py

@@ -726,12 +726,12 @@ class Session(nodes.Collector):
         ...
 
     @overload
-    def perform_collect(  # noqa: F811
+    def perform_collect(
         self, args: Optional[Sequence[str]] = ..., genitems: bool = ...
     ) -> Sequence[Union[nodes.Item, nodes.Collector]]:
         ...
 
-    def perform_collect(  # noqa: F811
+    def perform_collect(
         self, args: Optional[Sequence[str]] = None, genitems: bool = True
     ) -> Sequence[Union[nodes.Item, nodes.Collector]]:
         """Perform the collection phase for this session.

src/_pytest/mark/structures.py

@@ -406,7 +406,7 @@ def normalize_mark_list(
     for mark in mark_list:
         mark_obj = getattr(mark, "mark", mark)
         if not isinstance(mark_obj, Mark):
-            raise TypeError(f"got {repr(mark_obj)} instead of Mark")
+            raise TypeError(f"got {mark_obj!r} instead of Mark")
         yield mark_obj
 
 

src/_pytest/python.py

@@ -358,7 +358,7 @@ class PyobjMixin(nodes.Node):
 # hook is not called for them.
 # fmt: off
 class _EmptyClass: pass  # noqa: E701
-IGNORED_ATTRIBUTES = frozenset.union(  # noqa: E305
+IGNORED_ATTRIBUTES = frozenset.union(
     frozenset(),
     # Module.
     dir(types.ModuleType("empty_module")),

src/_pytest/python_api.py

@@ -730,7 +730,7 @@ def approx(expected, rel=None, abs=None, nan_ok: bool = False) -> ApproxBase:
         # Type ignored because the error is wrong -- not unreachable.
         and not isinstance(expected, STRING_TYPES)  # type: ignore[unreachable]
     ):
-        msg = f"pytest.approx() only supports ordered sequences, but got: {repr(expected)}"
+        msg = f"pytest.approx() only supports ordered sequences, but got: {expected!r}"
         raise TypeError(msg)
     else:
         cls = ApproxScalar
@@ -780,7 +780,7 @@ def raises(
 
 
 @overload
-def raises(  # noqa: F811
+def raises(
     expected_exception: Union[Type[E], Tuple[Type[E], ...]],
     func: Callable[..., Any],
     *args: Any,
@@ -789,7 +789,7 @@ def raises(  # noqa: F811
     ...
 
 
-def raises(  # noqa: F811
+def raises(
     expected_exception: Union[Type[E], Tuple[Type[E], ...]], *args: Any, **kwargs: Any
 ) -> Union["RaisesContext[E]", _pytest._code.ExceptionInfo[E]]:
     r"""Assert that a code block/function call raises an exception type, or one of its subclasses.

src/_pytest/recwarn.py

@@ -47,13 +47,11 @@ def deprecated_call(
 
 
 @overload
-def deprecated_call(  # noqa: F811
-    func: Callable[..., T], *args: Any, **kwargs: Any
-) -> T:
+def deprecated_call(func: Callable[..., T], *args: Any, **kwargs: Any) -> T:
     ...
 
 
-def deprecated_call(  # noqa: F811
+def deprecated_call(
     func: Optional[Callable[..., Any]] = None, *args: Any, **kwargs: Any
 ) -> Union["WarningsRecorder", Any]:
     """Assert that code produces a ``DeprecationWarning`` or ``PendingDeprecationWarning`` or ``FutureWarning``.
@@ -97,7 +95,7 @@ def warns(
 
 
 @overload
-def warns(  # noqa: F811
+def warns(
     expected_warning: Union[Type[Warning], Tuple[Type[Warning], ...]],
     func: Callable[..., T],
     *args: Any,
@@ -106,7 +104,7 @@ def warns(  # noqa: F811
     ...
 
 
-def warns(  # noqa: F811
+def warns(
     expected_warning: Union[Type[Warning], Tuple[Type[Warning], ...]] = Warning,
     *args: Any,
     match: Optional[Union[str, Pattern[str]]] = None,

testing/_py/test_local.py

@@ -17,7 +17,7 @@ import pytest
 def ignore_encoding_warning():
     with warnings.catch_warnings():
         with contextlib.suppress(NameError):  # new in 3.10
-            warnings.simplefilter("ignore", EncodingWarning)  # type: ignore [name-defined]  # noqa: F821
+            warnings.simplefilter("ignore", EncodingWarning)  # type: ignore [name-defined]
         yield
 
 

testing/logging/test_reporting.py

@@ -1032,7 +1032,7 @@ def test_log_set_path(pytester: Pytester) -> None:
             def pytest_runtest_setup(item):
                 config = item.config
                 logging_plugin = config.pluginmanager.get_plugin("logging-plugin")
-                report_file = os.path.join({repr(report_dir_base)}, item._request.node.name)
+                report_file = os.path.join({report_dir_base!r}, item._request.node.name)
                 logging_plugin.set_log_path(report_file)
                 return (yield)
         """

testing/python/fixtures.py

@@ -3086,7 +3086,7 @@ class TestFixtureMarker:
             def test_other():
                 pass
         """  # noqa: UP031 (python syntax issues)
-            % {"scope": scope}  # noqa: UP031 (python syntax issues)
+            % {"scope": scope}
         )
         reprec = pytester.inline_run("-lvs")
         reprec.assertoutcome(passed=3)

testing/python/raises.py

@@ -147,7 +147,7 @@ class TestRaises:
         try:
             pytest.raises(ValueError, int, "0")
         except pytest.fail.Exception as e:
-            assert e.msg == f"DID NOT RAISE {repr(ValueError)}"
+            assert e.msg == f"DID NOT RAISE {ValueError!r}"
         else:
             assert False, "Expected pytest.raises.Exception"
 
@@ -155,7 +155,7 @@ class TestRaises:
             with pytest.raises(ValueError):
                 pass
         except pytest.fail.Exception as e:
-            assert e.msg == f"DID NOT RAISE {repr(ValueError)}"
+            assert e.msg == f"DID NOT RAISE {ValueError!r}"
         else:
             assert False, "Expected pytest.raises.Exception"
 

testing/test_assertion.py

@@ -914,16 +914,16 @@ class TestAssert_reprcompare:
         assert expl == [
             r"'hyv\xe4' == 'hyva\u0308'",
             "",
-            f"- {str(right)}",
-            f"+ {str(left)}",
+            f"- {right!s}",
+            f"+ {left!s}",
         ]
 
         expl = callequal(left, right, verbose=2)
         assert expl == [
             r"'hyv\xe4' == 'hyva\u0308'",
             "",
-            f"- {str(right)}",
-            f"+ {str(left)}",
+            f"- {right!s}",
+            f"+ {left!s}",
         ]
 
 

testing/test_doctest.py

@@ -190,7 +190,7 @@ class TestDoctests:
         )
         doctest = f"""
             >>> "{test_string}"
-            {repr(test_string)}
+            {test_string!r}
         """
         fn = pytester.path / "test_encoding.txt"
         fn.write_text(doctest, encoding=encoding)

testing/test_pytester.py

@@ -227,7 +227,7 @@ class TestInlineRunModulesCleanup:
 
     def spy_factory(self):
         class SysModulesSnapshotSpy:
-            instances: List["SysModulesSnapshotSpy"] = []  # noqa: F821
+            instances: List["SysModulesSnapshotSpy"] = []
 
             def __init__(self, preserve=None) -> None:
                 SysModulesSnapshotSpy.instances.append(self)
@@ -725,7 +725,7 @@ def test_run_result_repr() -> None:
     # known exit code
     r = pytester_mod.RunResult(1, outlines, errlines, duration=0.5)
     assert repr(r) == (
-        f"<RunResult ret={str(pytest.ExitCode.TESTS_FAILED)} len(stdout.lines)=3"
+        f"<RunResult ret={pytest.ExitCode.TESTS_FAILED!s} len(stdout.lines)=3"
         " len(stderr.lines)=4 duration=0.50s>"
     )