Add __all__ to most modules beginning with 'n', 'o' and 'p' (#7345)

stdlib/pdb.pyi

@@ -8,6 +8,8 @@ from types import CodeType, FrameType, TracebackType
 from typing import IO, Any, Callable, ClassVar, Iterable, Mapping, Sequence, TypeVar
 from typing_extensions import ParamSpec
 
+__all__ = ["run", "pm", "Pdb", "runeval", "runctx", "runcall", "set_trace", "post_mortem", "help"]
+
 _T = TypeVar("_T")
 _P = ParamSpec("_P")