Handle Index without arguments, subclassing DataFrame and registe…

…r accessor arguments (#1091)

* maybe keep these

* keep PandasDelegate

pandas-stubs/_typing.pyi

@@ -464,6 +464,7 @@ T = TypeVar("T")
 P = ParamSpec("P")
 FuncType: TypeAlias = Callable[..., Any]
 F = TypeVar("F", bound=FuncType)
+TypeT = TypeVar("TypeT", bound=type)
 HashableT = TypeVar("HashableT", bound=Hashable)
 HashableT1 = TypeVar("HashableT1", bound=Hashable)
 HashableT2 = TypeVar("HashableT2", bound=Hashable)

pandas-stubs/core/accessor.pyi

@@ -1,15 +1,9 @@
-from typing import Any
+from typing import Callable
 
-class PandasDelegate: ...
-
-def delegate_names(
-    delegate: Any, accessors: Any, typ: str, overwrite: bool = ...
-) -> Any: ...
+from pandas._typing import TypeT
 
-class CachedAccessor:
-    def __init__(self, name: str, accessor: Any) -> None: ...
-    def __get__(self, obj: Any, cls: Any): ...
+class PandasDelegate: ...
 
-def register_dataframe_accessor(name: Any): ...
-def register_series_accessor(name: Any): ...
-def register_index_accessor(name: Any): ...
+def register_dataframe_accessor(name: str) -> Callable[[TypeT], TypeT]: ...
+def register_series_accessor(name: str) -> Callable[[TypeT], TypeT]: ...
+def register_index_accessor(name: str) -> Callable[[TypeT], TypeT]: ...