CategoricalIndex.is_categorical()
CategoricalIndex.item()
CategoricalIndex.summary(name=None)
CategoricalIndex.remove_unused_categories(*args, **kwargs)
CategoricalIndex.factorize(sort=False, na_sentinel=-1)
CategoricalIndex.hasnans = None
CategoricalIndex.is_floating()
CategoricalIndex.base return the base object if the memory of the underlying data is shared
CategoricalIndex.ordered
CategoricalIndex.identical(other)
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