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28 lines
778 B

cdef class NDFrameIndexerBase:
"""
A base class for _NDFrameIndexer for fast instantiation and attribute access.
"""
cdef:
Py_ssize_t _ndim
cdef public:
str name
object obj
def __init__(self, name: str, obj):
self.obj = obj
self.name = name
self._ndim = -1
@property
def ndim(self) -> int:
# Delay `ndim` instantiation until required as reading it
# from `obj` isn't entirely cheap.
ndim = self._ndim
if ndim == -1:
ndim = self._ndim = self.obj.ndim
if ndim > 2:
raise ValueError( # pragma: no cover
"NDFrameIndexer does not support NDFrame objects with ndim > 2"
)
return ndim