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from typing import ( Generic, TypeVar, ) from pandas.core.indexing import IndexingMixin _IndexingMixinT = TypeVar("_IndexingMixinT", bound=IndexingMixin) class NDFrameIndexerBase(Generic[_IndexingMixinT]): name: str # in practice obj is either a DataFrame or a Series obj: _IndexingMixinT def __init__(self, name: str, obj: _IndexingMixinT) -> None: ... @property def ndim(self) -> int: ...