Remove unnecessary ellipsis expressions (#9976)

Ignore flake8 F821 warnings in stub files

stdlib/concurrent/futures/process.pyi

@@ -153,9 +153,9 @@ def _chain_from_iterable_of_lists(iterable: Iterable[MutableSequence[Any]]) -> A
 class BrokenProcessPool(BrokenExecutor): ...
 
 class ProcessPoolExecutor(Executor):
-    _mp_context: BaseContext | None = ...
-    _initializer: Callable[..., None] | None = ...
-    _initargs: tuple[Any, ...] = ...
+    _mp_context: BaseContext | None
+    _initializer: Callable[..., None] | None
+    _initargs: tuple[Any, ...]
     _executor_manager_thread: _ThreadWakeup
     _processes: MutableMapping[int, Process]
     _shutdown_thread: bool

stdlib/concurrent/futures/thread.pyi

@@ -44,9 +44,9 @@ class ThreadPoolExecutor(Executor):
     _broken: bool
     _shutdown: bool
     _shutdown_lock: Lock
-    _thread_name_prefix: str | None = ...
-    _initializer: Callable[..., None] | None = ...
-    _initargs: tuple[Any, ...] = ...
+    _thread_name_prefix: str | None
+    _initializer: Callable[..., None] | None
+    _initargs: tuple[Any, ...]
     _work_queue: queue.SimpleQueue[_WorkItem[Any]]
     def __init__(
         self,

stdlib/dis.pyi

@@ -39,10 +39,10 @@ _HaveCodeType: TypeAlias = types.MethodType | types.FunctionType | types.CodeTyp
 
 if sys.version_info >= (3, 11):
     class Positions(NamedTuple):
-        lineno: int | None = ...
-        end_lineno: int | None = ...
-        col_offset: int | None = ...
-        end_col_offset: int | None = ...
+        lineno: int | None = None
+        end_lineno: int | None = None
+        col_offset: int | None = None
+        end_col_offset: int | None = None
 
 if sys.version_info >= (3, 11):
     class Instruction(NamedTuple):
@@ -54,7 +54,7 @@ if sys.version_info >= (3, 11):
         offset: int
         starts_line: int | None
         is_jump_target: bool
-        positions: Positions | None = ...
+        positions: Positions | None = None
 
 else:
     class Instruction(NamedTuple):

stdlib/multiprocessing/forkserver.pyi

@@ -24,7 +24,7 @@ def main(
 def read_signed(fd: int) -> Any: ...
 def write_signed(fd: int, n: int) -> None: ...
 
-_forkserver: ForkServer = ...
+_forkserver: ForkServer
 ensure_running = _forkserver.ensure_running
 get_inherited_fds = _forkserver.get_inherited_fds
 connect_to_new_process = _forkserver.connect_to_new_process

stdlib/multiprocessing/resource_tracker.pyi

@@ -9,7 +9,7 @@ class ResourceTracker:
     def register(self, name: Sized, rtype: Incomplete) -> None: ...
     def unregister(self, name: Sized, rtype: Incomplete) -> None: ...
 
-_resource_tracker: ResourceTracker = ...
+_resource_tracker: ResourceTracker
 ensure_running = _resource_tracker.ensure_running
 register = _resource_tracker.register
 unregister = _resource_tracker.unregister

stdlib/pydoc.pyi

@@ -70,7 +70,7 @@ class HTMLRepr(Repr):
     def repr_unicode(self, x: AnyStr, level: complex) -> str: ...
 
 class HTMLDoc(Doc):
-    _repr_instance: HTMLRepr = ...
+    _repr_instance: HTMLRepr
     repr = _repr_instance.repr
     escape = _repr_instance.escape
     def page(self, title: str, contents: str) -> str: ...
@@ -154,7 +154,7 @@ class TextRepr(Repr):
     def repr_instance(self, x: object, level: complex) -> str: ...
 
 class TextDoc(Doc):
-    _repr_instance: TextRepr = ...
+    _repr_instance: TextRepr
     repr = _repr_instance.repr
     def bold(self, text: str) -> str: ...
     def indent(self, text: str, prefix: str = "    ") -> str: ...

stdlib/random.pyi

@@ -100,9 +100,7 @@ class SystemRandom(Random):
     def getstate(self, *args: Any, **kwds: Any) -> NoReturn: ...
     def setstate(self, *args: Any, **kwds: Any) -> NoReturn: ...
 
-# ----- random function stubs -----
-
-_inst: Random = ...
+_inst: Random
 seed = _inst.seed
 random = _inst.random
 uniform = _inst.uniform

stdlib/typing.pyi

@@ -167,20 +167,14 @@ _T = TypeVar("_T")
 
 def overload(func: _F) -> _F: ...
 
-# Unlike the vast majority module-level objects in stub files,
-# these `_SpecialForm` objects in typing need the default value `= ...`,
-# due to the fact that they are used elswhere in the same file.
-# Otherwise, flake8 erroneously flags them as undefined.
-# `_SpecialForm` objects in typing.py that are not used elswhere in the same file
-# do not need the default value assignment.
-Union: _SpecialForm = ...
-Generic: _SpecialForm = ...
+Union: _SpecialForm
+Generic: _SpecialForm
 # Protocol is only present in 3.8 and later, but mypy needs it unconditionally
-Protocol: _SpecialForm = ...
-Callable: _SpecialForm = ...
-Type: _SpecialForm = ...
-NoReturn: _SpecialForm = ...
-ClassVar: _SpecialForm = ...
+Protocol: _SpecialForm
+Callable: _SpecialForm
+Type: _SpecialForm
+NoReturn: _SpecialForm
+ClassVar: _SpecialForm
 
 Optional: _SpecialForm
 Tuple: _SpecialForm
@@ -193,7 +187,7 @@ if sys.version_info >= (3, 8):
 
 if sys.version_info >= (3, 11):
     Self: _SpecialForm
-    Never: _SpecialForm = ...
+    Never: _SpecialForm
     Unpack: _SpecialForm
     Required: _SpecialForm
     NotRequired: _SpecialForm

stdlib/typing_extensions.pyi

@@ -113,7 +113,7 @@ class _SpecialForm:
 # typing.Protocol and typing_extensions.Protocol so they can properly
 # warn users about potential runtime exceptions when using typing.Protocol
 # on older versions of Python.
-Protocol: _SpecialForm = ...
+Protocol: _SpecialForm
 
 def runtime_checkable(cls: _TC) -> _TC: ...