pandas.CategoricalIndex.as_ordered
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CategoricalIndex.as_ordered(*args, **kwargs)[source]
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Sets the Categorical to be ordered Parameters: inplace : boolean (default: False) Whether or not to set the ordered attribute inplace or return a copy of this categorical with ordered set to True 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.CategoricalIndex.as_ordered.html