th:`str.decode` in python2 and :meth:`bytes.decode` in
        python3.

        Parameters
        ----------
        encoding : str
        errors : str, optional

        Returns
        -------
        Series or Index

        Examples
        --------
        For Series:

        >>> ser = pd.Series([b'cow', b'123', b'()'])
        >>> ser.str.decode('ascii')
        0   cow
        1   123
        2   ()
        dtype: object
        c