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pandas.CategoricalIndex.nunique

CategoricalIndex.nunique(dropna=True) [source]

Return number of unique elements in the object.

Excludes NA values by default.

Parameters:

dropna : boolean, default True

Don’t include NaN in the count.

Returns:

nunique : int

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http://pandas.pydata.org/pandas-docs/version/0.19.2/generated/pandas.CategoricalIndex.nunique.html