CategoricalIndex.factorize(sort=False, na_sentinel=-1)
CategoricalIndex.itemsize return the size of the dtype of the item of the underlying data
CategoricalIndex.identical(other)
CategoricalIndex.all(other=None)
CategoricalIndex.remove_categories(*args, **kwargs)
CategoricalIndex.union(other)
CategoricalIndex.drop(labels, errors='raise')
CategoricalIndex.set_value(arr, key, value)
CategoricalIndex.holds_integer()
CategoricalIndex.as_ordered(*args, **kwargs)
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