Merge pull request #11914 - Activate flake8-bugbear and flake8-pyi

Author: Pierre-Sassoulas

pyproject.toml

@@ -128,15 +128,24 @@ ignore = "W009"
 src = ["src"]
 line-length = 88
 select = [
+    "B",  # bugbear
     "D",  # pydocstyle
     "E",  # pycodestyle
     "F",  # pyflakes
     "I",  # isort
+    "PYI", # flake8-pyi
     "UP", # pyupgrade
     "RUF", # ruff
     "W",  # pycodestyle
 ]
 ignore = [
+    # bugbear ignore
+    "B004", # Using `hasattr(x, "__call__")` to test if x is callable is unreliable.
+    "B007", # Loop control variable `i` not used within loop body
+    "B009", # Do not call `getattr` with a constant attribute value
+    "B010", # [*] Do not call `setattr` with a constant attribute value.
+    "B011", # Do not `assert False` (`python -O` removes these calls)
+    "B028", # No explicit `stacklevel` keyword argument found
     # pycodestyle ignore
     # pytest can do weird low-level things, and we usually know
     # what we're doing when we use type(..) is ...
@@ -180,4 +189,6 @@ known-local-folder = ["pytest", "_pytest"]
 lines-after-imports = 2
 
 [tool.ruff.lint.per-file-ignores]
+"src/_pytest/_py/**/*.py" = ["B", "PYI"]
 "src/_pytest/_version.py" = ["I001"]
+"testing/python/approx.py" = ["B015"]

scripts/prepare-release-pr.py

@@ -79,7 +79,7 @@ def prepare_release_pr(
         )
     except InvalidFeatureRelease as e:
         print(f"{Fore.RED}{e}")
-        raise SystemExit(1)
+        raise SystemExit(1) from None
 
     print(f"Version: {Fore.CYAN}{version}")
 

scripts/update-plugin-list.py

@@ -208,7 +208,7 @@ def main() -> None:
         f.write(f"This list contains {len(plugins)} plugins.\n\n")
         f.write(".. only:: not latex\n\n")
 
-        wcwidth  # reference library that must exist for tabulate to work
+        _ = wcwidth  # reference library that must exist for tabulate to work
         plugin_table = tabulate.tabulate(plugins, headers="keys", tablefmt="rst")
         f.write(indent(plugin_table, "   "))
         f.write("\n\n")

src/_pytest/_io/terminalwriter.py

@@ -232,17 +232,17 @@ def _highlight(
                 # which may lead to the previous color being propagated to the
                 # start of the expression, so reset first.
                 return "\x1b[0m" + highlighted
-            except pygments.util.ClassNotFound:
+            except pygments.util.ClassNotFound as e:
                 raise UsageError(
                     "PYTEST_THEME environment variable had an invalid value: '{}'. "
                     "Only valid pygment styles are allowed.".format(
                         os.getenv("PYTEST_THEME")
                     )
-                )
-            except pygments.util.OptionError:
+                ) from e
+            except pygments.util.OptionError as e:
                 raise UsageError(
                     "PYTEST_THEME_MODE environment variable had an invalid value: '{}'. "
                     "The only allowed values are 'dark' and 'light'.".format(
                         os.getenv("PYTEST_THEME_MODE")
                     )
-                )
+                ) from e

src/_pytest/capture.py

@@ -598,7 +598,8 @@ class CaptureResult(NamedTuple, Generic[AnyStr]):
 else:
 
     class CaptureResult(
-        collections.namedtuple("CaptureResult", ["out", "err"]), Generic[AnyStr]
+        collections.namedtuple("CaptureResult", ["out", "err"]),  # noqa: PYI024
+        Generic[AnyStr],
     ):
         """The result of :method:`caplog.readouterr() <pytest.CaptureFixture.readouterr>`."""
 

src/_pytest/compat.py

@@ -15,11 +15,6 @@
 from typing import Callable
 from typing import Final
 from typing import NoReturn
-from typing import TypeVar
-
-
-_T = TypeVar("_T")
-_S = TypeVar("_S")
 
 
 # fmt: off

src/_pytest/config/__init__.py

@@ -1848,13 +1848,13 @@ def parse_warning_filter(
     try:
         action: "warnings._ActionKind" = warnings._getaction(action_)  # type: ignore[attr-defined]
     except warnings._OptionError as e:
-        raise UsageError(error_template.format(error=str(e)))
+        raise UsageError(error_template.format(error=str(e))) from None
     try:
         category: Type[Warning] = _resolve_warning_category(category_)
     except Exception:
         exc_info = ExceptionInfo.from_current()
         exception_text = exc_info.getrepr(style="native")
-        raise UsageError(error_template.format(error=exception_text))
+        raise UsageError(error_template.format(error=exception_text)) from None
     if message and escape:
         message = re.escape(message)
     if module and escape:
@@ -1867,7 +1867,7 @@ def parse_warning_filter(
         except ValueError as e:
             raise UsageError(
                 error_template.format(error=f"invalid lineno {lineno_!r}: {e}")
-            )
+            ) from None
     else:
         lineno = 0
     return action, message, category, module, lineno

src/_pytest/unittest.py

@@ -209,8 +209,8 @@ def _addexcinfo(self, rawexcinfo: "_SysExcInfoType") -> None:
             )
             # Invoke the attributes to trigger storing the traceback
             # trial causes some issue there.
-            excinfo.value
-            excinfo.traceback
+            _ = excinfo.value
+            _ = excinfo.traceback
         except TypeError:
             try:
                 try:
@@ -361,14 +361,21 @@ def pytest_runtest_makereport(item: Item, call: CallInfo[None]) -> None:
 
 
 # Twisted trial support.
+classImplements_has_run = False
 
 
 @hookimpl(wrapper=True)
 def pytest_runtest_protocol(item: Item) -> Generator[None, object, object]:
     if isinstance(item, TestCaseFunction) and "twisted.trial.unittest" in sys.modules:
         ut: Any = sys.modules["twisted.python.failure"]
+        global classImplements_has_run
         Failure__init__ = ut.Failure.__init__
-        check_testcase_implements_trial_reporter()
+        if not classImplements_has_run:
+            from twisted.trial.itrial import IReporter
+            from zope.interface import classImplements
+
+            classImplements(TestCaseFunction, IReporter)
+            classImplements_has_run = True
 
         def excstore(
             self, exc_value=None, exc_type=None, exc_tb=None, captureVars=None
@@ -396,16 +403,6 @@ def excstore(
     return res
 
 
-def check_testcase_implements_trial_reporter(done: List[int] = []) -> None:
-    if done:
-        return
-    from twisted.trial.itrial import IReporter
-    from zope.interface import classImplements
-
-    classImplements(TestCaseFunction, IReporter)
-    done.append(1)
-
-
 def _is_skipped(obj) -> bool:
     """Return True if the given object has been marked with @unittest.skip."""
     return bool(getattr(obj, "__unittest_skip__", False))

testing/_py/test_local.py

@@ -1241,9 +1241,9 @@ class TestWINLocalPath:
 
     def test_owner_group_not_implemented(self, path1):
         with pytest.raises(NotImplementedError):
-            path1.stat().owner
+            _ = path1.stat().owner
         with pytest.raises(NotImplementedError):
-            path1.stat().group
+            _ = path1.stat().group
 
     def test_chmod_simple_int(self, path1):
         mode = path1.stat().mode

testing/code/test_excinfo.py

@@ -387,7 +387,7 @@ def test_excinfo_no_python_sourcecode(tmp_path: Path) -> None:
     excinfo = pytest.raises(ValueError, template.render, h=h)
     for item in excinfo.traceback:
         print(item)  # XXX: for some reason jinja.Template.render is printed in full
-        item.source  # shouldn't fail
+        _ = item.source  # shouldn't fail
         if isinstance(item.path, Path) and item.path.name == "test.txt":
             assert str(item.source) == "{{ h()}}:"
 
@@ -418,7 +418,7 @@ def test_codepath_Queue_example() -> None:
 
 def test_match_succeeds():
     with pytest.raises(ZeroDivisionError) as excinfo:
-        0 // 0
+        _ = 0 // 0
     excinfo.match(r".*zero.*")
 
 
@@ -584,7 +584,7 @@ def test_repr_source_excinfo(self) -> None:
         try:
 
             def f():
-                1 / 0
+                _ = 1 / 0
 
             f()
 
@@ -601,7 +601,7 @@ def f():
             print(line)
         assert lines == [
             "    def f():",
-            ">       1 / 0",
+            ">       _ = 1 / 0",
             "E       ZeroDivisionError: division by zero",
         ]
 
@@ -638,7 +638,7 @@ def test_repr_source_failing_fullsource(self, monkeypatch) -> None:
         pr = FormattedExcinfo()
 
         try:
-            1 / 0
+            _ = 1 / 0
         except ZeroDivisionError:
             excinfo = ExceptionInfo.from_current()
 
@@ -1582,7 +1582,7 @@ def __getattr__(self, attr):
             return getattr(self, "_" + attr)
 
     with pytest.raises(RuntimeError) as excinfo:
-        RecursionDepthError().trigger
+        _ = RecursionDepthError().trigger
     assert "maximum recursion" in str(excinfo.getrepr())
 
 

testing/python/raises.py

@@ -280,7 +280,7 @@ def __class__(self):
 
     def test_raises_context_manager_with_kwargs(self):
         with pytest.raises(TypeError) as excinfo:
-            with pytest.raises(Exception, foo="bar"):  # type: ignore[call-overload]
+            with pytest.raises(OSError, foo="bar"):  # type: ignore[call-overload]
                 pass
         assert "Unexpected keyword arguments" in str(excinfo.value)
 

testing/test_assertion.py

@@ -1,10 +1,10 @@
 # mypy: allow-untyped-defs
-import collections
 import sys
 import textwrap
 from typing import Any
 from typing import List
 from typing import MutableSequence
+from typing import NamedTuple
 from typing import Optional
 
 import attr
@@ -1179,7 +1179,9 @@ def __eq__(self, other):  # pragma: no cover
 
 class TestAssert_reprcompare_namedtuple:
     def test_namedtuple(self) -> None:
-        NT = collections.namedtuple("NT", ["a", "b"])
+        class NT(NamedTuple):
+            a: Any
+            b: Any
 
         left = NT(1, "b")
         right = NT(1, "c")
@@ -1200,8 +1202,13 @@ def test_namedtuple(self) -> None:
         ]
 
     def test_comparing_two_different_namedtuple(self) -> None:
-        NT1 = collections.namedtuple("NT1", ["a", "b"])
-        NT2 = collections.namedtuple("NT2", ["a", "b"])
+        class NT1(NamedTuple):
+            a: Any
+            b: Any
+
+        class NT2(NamedTuple):
+            a: Any
+            b: Any
 
         left = NT1(1, "b")
         right = NT2(2, "b")

testing/test_compat.py

@@ -169,17 +169,17 @@ def raise_fail_outcome(self):
 
 def test_helper_failures() -> None:
     helper = ErrorsHelper()
-    with pytest.raises(Exception):
-        helper.raise_exception
+    with pytest.raises(Exception):  # noqa: B017
+        _ = helper.raise_exception
     with pytest.raises(OutcomeException):
-        helper.raise_fail_outcome
+        _ = helper.raise_fail_outcome
 
 
 def test_safe_getattr() -> None:
     helper = ErrorsHelper()
     assert safe_getattr(helper, "raise_exception", "default") == "default"
     assert safe_getattr(helper, "raise_fail_outcome", "default") == "default"
-    with pytest.raises(BaseException):
+    with pytest.raises(BaseException):  # noqa: B017
         assert safe_getattr(helper, "raise_baseexception", "default")
 
 

testing/test_legacypath.py

@@ -108,7 +108,7 @@ def test_session_scoped_unavailable_attributes(self, session_request):
             AttributeError,
             match="path not available in session-scoped context",
         ):
-            session_request.fspath
+            _ = session_request.fspath
 
 
 @pytest.mark.parametrize("config_type", ["ini", "pyproject"])

testing/test_mark.py

@@ -42,7 +42,7 @@ class SomeClass:
     def test_pytest_mark_name_starts_with_underscore(self) -> None:
         mark = MarkGenerator(_ispytest=True)
         with pytest.raises(AttributeError):
-            mark._some_name
+            _ = mark._some_name
 
 
 def test_marked_class_run_twice(pytester: Pytester) -> None:

testing/test_recwarn.py

@@ -228,7 +228,7 @@ def test_deprecated_call_specificity(self) -> None:
         for warning in other_warnings:
 
             def f():
-                warnings.warn(warning("hi"))
+                warnings.warn(warning("hi"))  # noqa: B023
 
             with pytest.warns(warning):
                 with pytest.raises(pytest.fail.Exception):

testing/test_terminal.py

@@ -1,6 +1,5 @@
 # mypy: allow-untyped-defs
 """Terminal reporting of the full testing process."""
-import collections
 from io import StringIO
 import os
 from pathlib import Path
@@ -10,6 +9,7 @@
 from typing import cast
 from typing import Dict
 from typing import List
+from typing import NamedTuple
 from typing import Tuple
 
 import pluggy
@@ -34,7 +34,9 @@
 import pytest
 
 
-DistInfo = collections.namedtuple("DistInfo", ["project_name", "version"])
+class DistInfo(NamedTuple):
+    project_name: str
+    version: int
 
 
 TRANS_FNMATCH = str.maketrans({"[": "[[]", "]": "[]]"})

testing/test_warnings.py

@@ -18,8 +18,7 @@
 def pyfile_with_warnings(pytester: Pytester, request: FixtureRequest) -> str:
     """Create a test file which calls a function in a module which generates warnings."""
     pytester.syspathinsert()
-    test_name = request.function.__name__
-    module_name = test_name.lstrip("test_") + "_module"
+    module_name = request.function.__name__[len("test_") :] + "_module"
     test_file = pytester.makepyfile(
         f"""
         import {module_name}