Run mypy and pyright on our py312 stubs in CI (#10119)

tests/mypy_test.py

@@ -47,7 +47,7 @@ except ImportError:
     print_error("Cannot import mypy. Did you install it?")
     sys.exit(1)
 
-SUPPORTED_VERSIONS = ["3.11", "3.10", "3.9", "3.8", "3.7"]
+SUPPORTED_VERSIONS = ["3.12", "3.11", "3.10", "3.9", "3.8", "3.7"]
 SUPPORTED_PLATFORMS = ("linux", "win32", "darwin")
 DIRECTORIES_TO_TEST = [Path("stdlib"), Path("stubs")]
 
@@ -76,6 +76,13 @@ def valid_path(cmd_arg: str) -> Path:
     return path
 
 
+def remove_dev_suffix(version: str) -> str:
+    """Helper function for argument-parsing"""
+    if version.endswith("-dev"):
+        return version[: -len("-dev")]
+    return version
+
+
 parser = argparse.ArgumentParser(
     description="Typecheck typeshed's stubs with mypy. Patterns are unanchored regexps on the full path."
 )
@@ -105,7 +112,7 @@ parser.add_argument("-v", "--verbose", action="count", default=0, help="More out
 parser.add_argument(
     "-p",
     "--python-version",
-    type=str,
+    type=remove_dev_suffix,
     choices=SUPPORTED_VERSIONS,
     nargs="*",
     action="extend",

tests/regr_test.py

@@ -35,7 +35,7 @@ VENV_DIR = ".venv"
 TYPESHED = "typeshed"
 
 SUPPORTED_PLATFORMS = ["linux", "darwin", "win32"]
-SUPPORTED_VERSIONS = ["3.11", "3.10", "3.9", "3.8", "3.7"]
+SUPPORTED_VERSIONS = ["3.12", "3.11", "3.10", "3.9", "3.8", "3.7"]
 
 
 def package_with_test_cases(package_name: str) -> PackageInfo:

tests/typecheck_typeshed.py

@@ -13,7 +13,7 @@ from utils import colored, print_error
 ReturnCode: TypeAlias = int
 
 SUPPORTED_PLATFORMS = ("linux", "darwin", "win32")
-SUPPORTED_VERSIONS = ("3.11", "3.10", "3.9")
+SUPPORTED_VERSIONS = ("3.12", "3.11", "3.10", "3.9")
 LOWEST_SUPPORTED_VERSION = min(SUPPORTED_VERSIONS, key=lambda x: int(x.split(".")[1]))
 DIRECTORIES_TO_TEST = ("scripts", "tests")
 EMPTY: list[str] = []