pandas.CategoricalIndex.reorder_categories
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CategoricalIndex.reorder_categories(*args, **kwargs)[source]
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Reorders categories as specified in new_categories. new_categoriesneed to include all old categories and no new category items.Parameters: new_categories : Index-like The categories in new order. ordered : boolean, optional Whether or not the categorical is treated as a ordered categorical. If not given, do not change the ordered information. inplace : boolean (default: False) Whether or not to reorder the categories inplace or return a copy of this categorical with reordered categories. Returns: cat : Categorical with reordered categories or None if inplace. Raises: ValueError If the new categories do not contain all old category items or any new ones 
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    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.CategoricalIndex.reorder_categories.html