# pandas.Series.cat.rename_categories

Series.cat.rename_categories(*args, **kwargs)

  Rename categories.

  Parameters
    new_categories list-like, dict-like or callable

      New categories which will replace old categories.

      - list-like: all items must be unique and the number of items in the new categories must match the existing number of categories.

      - dict-like: specifies a mapping from old categories to new. Categories not contained in the mapping are passed through and extra categories in the mapping are ignored.

      - callable : a callable that is called on all items in the old categories and whose return values comprise the new categories.

    inplace bool, default False

      Whether or not to rename the categories inplace or return a copy of this categorical with renamed categories.

      Deprecated since version 1.3.0.

  Returns
    cat Categorical or None

      Categorical with removed categories or None if `inplace=True`.

  Raises
    ValueError

      If new categories are list-like and do not have the same number of items than the current categories or do not validate as categories

  See also

  `reorder_categories`

    Reorder categories.

  `add_categories`

    Add new categories.

  `remove_categories`

    Remove the specified categories.

  `remove_unused_categories`

    Remove categories which are not used.

  `set_categories`

    Set the categories to the specified ones.

  Examples

      >>> c = pd.Categorical(['a', 'a', 'b'])
      >>> c.rename_categories([0, 1])
      [0, 0, 1]
      Categories (2, int64): [0, 1]

  For dict-like `new_categories`, extra keys are ignored and categories not in the dictionary are passed through

      >>> c.rename_categories({'a': 'A', 'c': 'C'})
      ['A', 'A', 'b']
      Categories (2, object): ['A', 'b']

  You may also provide a callable to create the new categories

      >>> c.rename_categories(lambda x: x.upper())
      ['A', 'A', 'B']
      Categories (2, object): ['A', 'B']