Update to Python 3.14.0b2 (#14182)

Author: srittau

stdlib/argparse.pyi

@@ -281,13 +281,7 @@ class HelpFormatter:
 
     if sys.version_info >= (3, 14):
         def __init__(
-            self,
-            prog: str,
-            indent_increment: int = 2,
-            max_help_position: int = 24,
-            width: int | None = None,
-            prefix_chars: str = "-",
-            color: bool = False,
+            self, prog: str, indent_increment: int = 2, max_help_position: int = 24, width: int | None = None, color: bool = False
         ) -> None: ...
     else:
         def __init__(

stdlib/concurrent/futures/interpreter.pyi

@@ -1,7 +1,7 @@
 import sys
 from collections.abc import Callable, Mapping
 from concurrent.futures import ThreadPoolExecutor
-from typing import Final, Literal, Protocol, overload, type_check_only
+from typing import Literal, Protocol, overload, type_check_only
 from typing_extensions import ParamSpec, Self, TypeAlias, TypeVar, TypeVarTuple, Unpack
 
 _Task: TypeAlias = tuple[bytes, Literal["function", "script"]]
@@ -37,8 +37,6 @@ if sys.version_info >= (3, 14):
     class ExecutionFailed(InterpreterError):
         def __init__(self, excinfo: _ExcInfo) -> None: ...  #  type: ignore[override]
 
-    UNBOUND: Final = 2
-
     class WorkerContext(ThreadWorkerContext):
         # Parent class doesn't have `shared` argument,
         @overload  #  type: ignore[override]

stdlib/multiprocessing/util.pyi

@@ -1,3 +1,4 @@
+import sys
 import threading
 from _typeshed import ConvertibleToInt, Incomplete, Unused
 from collections.abc import Callable, Iterable, Mapping, MutableMapping, Sequence
@@ -22,21 +23,30 @@ __all__ = [
     "SUBWARNING",
 ]
 
+if sys.version_info >= (3, 14):
+    __all__ += ["warn"]
+
 _T = TypeVar("_T")
 _R_co = TypeVar("_R_co", default=Any, covariant=True)
 
-NOTSET: Final[int]
-SUBDEBUG: Final[int]
-DEBUG: Final[int]
-INFO: Final[int]
-SUBWARNING: Final[int]
+NOTSET: Final = 0
+SUBDEBUG: Final = 5
+DEBUG: Final = 10
+INFO: Final = 20
+SUBWARNING: Final = 25
+if sys.version_info >= (3, 14):
+    WARNING: Final = 30
 
 LOGGER_NAME: Final[str]
 DEFAULT_LOGGING_FORMAT: Final[str]
 
 def sub_debug(msg: object, *args: object) -> None: ...
 def debug(msg: object, *args: object) -> None: ...
 def info(msg: object, *args: object) -> None: ...
+
+if sys.version_info >= (3, 14):
+    def warn(msg: object, *args: object) -> None: ...
+
 def sub_warning(msg: object, *args: object) -> None: ...
 def get_logger() -> Logger: ...
 def log_to_stderr(level: _LoggingLevel | None = None) -> Logger: ...

stdlib/string/templatelib.pyi

@@ -1,4 +1,5 @@
 from collections.abc import Iterator
+from types import GenericAlias
 from typing import Any, Literal, final
 
 __all__ = ["Interpolation", "Template"]
@@ -11,6 +12,7 @@ class Template:  # TODO: consider making `Template` generic on `TypeVarTuple`
     def __new__(cls, *args: str | Interpolation) -> Template: ...
     def __iter__(self) -> Iterator[str | Interpolation]: ...
     def __add__(self, other: Template | str) -> Template: ...
+    def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
     @property
     def values(self) -> tuple[Any, ...]: ...  # Tuple of interpolation values, which can have any type
 
@@ -26,3 +28,4 @@ class Interpolation:
     def __new__(
         cls, value: Any, expression: str, conversion: Literal["a", "r", "s"] | None = None, format_spec: str = ""
     ) -> Interpolation: ...
+    def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...

stdlib/zipfile/__init__.pyi

@@ -24,6 +24,9 @@ __all__ = [
     "LargeZipFile",
 ]
 
+if sys.version_info >= (3, 14):
+    __all__ += ["ZIP_ZSTANDARD"]
+
 # TODO: use TypeAlias for these two when mypy bugs are fixed
 # https://github.com/python/mypy/issues/16581
 _DateTuple = tuple[int, int, int, int, int, int]  # noqa: Y026
@@ -364,10 +367,21 @@ else:
 
 def is_zipfile(filename: StrOrBytesPath | _SupportsReadSeekTell) -> bool: ...
 
-ZIP_STORED: Final[int]
-ZIP_DEFLATED: Final[int]
 ZIP64_LIMIT: Final[int]
 ZIP_FILECOUNT_LIMIT: Final[int]
 ZIP_MAX_COMMENT: Final[int]
-ZIP_BZIP2: Final[int]
-ZIP_LZMA: Final[int]
+
+ZIP_STORED: Final = 0
+ZIP_DEFLATED: Final = 8
+ZIP_BZIP2: Final = 12
+ZIP_LZMA: Final = 14
+if sys.version_info >= (3, 14):
+    ZIP_ZSTANDARD: Final = 93
+
+DEFAULT_VERSION: Final[int]
+ZIP64_VERSION: Final[int]
+BZIP2_VERSION: Final[int]
+LZMA_VERSION: Final[int]
+if sys.version_info >= (3, 14):
+    ZSTANDARD_VERSION: Final[int]
+MAX_EXTRACT_VERSION: Final[int]