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# -*- coding: utf-8 -*-
cdef class _NDFrameIndexerBase:
"""
A base class for _NDFrameIndexer for fast instantiation and attribute
access.
"""
cdef public object obj, name, _ndim
def __init__(self, name, obj):
self.obj = obj
self.name = name
self._ndim = None
@property
def ndim(self):
# Delay `ndim` instantiation until required as reading it
# from `obj` isn't entirely cheap.
ndim = self._ndim
if ndim is None:
ndim = self._ndim = self.obj.ndim
return ndim
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