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    fill_value : scalar, optional
        Default value to fill in missing values if subgroups do not have the
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    >>> index = pd.MultiIndex.from_tuples([('one', 'a'), ('one', 'b'),
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    >>> s = pd.Series(np.arange(1, 5, dtype=np.int64), index=index)
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    two  a    3
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    >>> s.unstack(level=0)
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