def yview(self, index=None):
        """If index is not given a tuple containing two fractions is returned,
        each fraction is between 0 and 1. The first element gives the position
        of the table element at the top of the window, relative to the table
        as a whole. The second element gives the position of the table element
        just after the last one in the window, relative to the table as a
        whole.

        If index is given the view in the window is adjusted so that the
        row given by index is displayed at the top of the window."""
        res = self.tk.call(self._w, 'yview', index)
        if index is None:
            return self._getdoubles(res)
dataset/ETHPy150Open Arelle/Arelle/arelle/TkTableWrapper.py/Table.yview/original