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25 lines
753 B
25 lines
753 B
cdef class NDFrameIndexerBase:
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"""
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A base class for _NDFrameIndexer for fast instantiation and attribute access.
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"""
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cdef public:
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str name
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object obj, _ndim
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def __init__(self, name: str, obj):
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self.obj = obj
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self.name = name
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self._ndim = None
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@property
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def ndim(self) -> int:
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# Delay `ndim` instantiation until required as reading it
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# from `obj` isn't entirely cheap.
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ndim = self._ndim
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if ndim is None:
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ndim = self._ndim = self.obj.ndim
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if ndim > 2:
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raise ValueError( # pragma: no cover
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"NDFrameIndexer does not support NDFrame objects with ndim > 2"
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)
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return ndim
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