CategoricalIndex.join(other, how='left', level=None, return_indexers=False)
CategoricalIndex.get_values()
CategoricalIndex.size return the number of elements in the underlying data
CategoricalIndex.nlevels
CategoricalIndex.is_(other)
CategoricalIndex.symmetric_difference(other, result_name=None)
CategoricalIndex.categories
CategoricalIndex.asof(label)
CategoricalIndex.sortlevel(level=None, ascending=True, sort_remaining=None)
CategoricalIndex.searchsorted(key, side='left', sorter=None)
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