s=['A', 'B', 'C'])
        >>> df
            A   B   C
        0   0   2   3
        1   0   4   1
        2  10  20  30

        Get value at specified row/column pair

        >>> df.iat[1, 2]
        1

        Set value at specified row/column pair

        >>> df.iat[1, 2] = 10
        >>> df.iat[1, 2]
        10

        Get value within a series

        >>> df.loc[0].iat[1]
        2
        Ú