Merge branch 'main' into generate-distuttils-stubs-on-install

Author: Avasam

pyproject.toml

@@ -117,8 +117,8 @@ check = [
 
 	# local
 
-	# Removal of deprecated UP027, PT004 & PT005 astral-sh/ruff#14383
-	"ruff >= 0.8.0; sys_platform != 'cygwin'",
+	# Deprecated rules must now be selected by exact rule code
+	"ruff >= 0.13.0; sys_platform != 'cygwin'",
 ]
 
 cover = [
@@ -138,7 +138,7 @@ type = [
 	# pin mypy version so a new version doesn't suddenly cause the CI to fail,
 	# until types-setuptools is removed from typeshed.
 	# For help with static-typing issues, or mypy update, ping @Avasam
-	"mypy==1.14.*",
+	"mypy==1.18.*",
 	# Typing fixes in version newer than we require at runtime
 	"importlib_metadata>=7.0.2; python_version < '3.10'",
 	# Imported unconditionally in tools/finalize.py

ruff.toml

@@ -65,14 +65,14 @@ ignore = [
 	"TRY003", # raise-vanilla-args, avoid multitude of exception classes
 	"TRY301", # raise-within-try, it's handy
 	"UP015", # redundant-open-modes, explicit is preferred
-	"UP038", # Using `X | Y` in `isinstance` call is slower and more verbose https://github.com/astral-sh/ruff/issues/7871
 	# Only enforcing return type annotations for public functions
 	"ANN202", # missing-return-type-private-function
 ]
 
 [lint.per-file-ignores]
 # Suppress nuisance warnings about module-import-not-at-top-of-file (E402) due to workaround for #4476
 "setuptools/__init__.py" = ["E402"]
+# pkg_resources is due for removal, not worth fixing existing errors
 "pkg_resources/__init__.py" = ["E402", "ANN204"]
 "pkg_resources/tests/test_resources.py" = ["PT031"]
 

setuptools/build_meta.py

@@ -357,7 +357,9 @@ def _find_info_directory(self, metadata_directory: StrPath, suffix: str) -> Path
             candidates = [f for f in dirs if f.endswith(suffix)]
 
             if len(candidates) != 0 or len(dirs) != 1:
-                assert len(candidates) == 1, f"Multiple {suffix} directories found"
+                assert len(candidates) == 1, (
+                    f"Exactly one {suffix} should have been produced, but found {len(candidates)}: {candidates}"
+                )
                 return Path(parent, candidates[0])
 
         msg = f"No {suffix} directory found in {metadata_directory}"