CategoricalIndex.argmax(axis=None)

CategoricalIndex.flags

CategoricalIndex.set_value(arr, key, value)

CategoricalIndex.isin(values, level=None)

CategoricalIndex.get_value(series, key)

CategoricalIndex.putmask(mask, value)

CategoricalIndex.union(other)

CategoricalIndex.ndim return the number of dimensions of the underlying data, by definition 1

CategoricalIndex.ravel(order='C')

CategoricalIndex.get_loc(key, method=None)