def toList(self):
        """
        Return a list with the DataFrame data.
        """
        if self.getNumCols() > 1:
            return [
                tuple(self.getRowByIndex(i))
                for i in range(self.getNumRows())
            ]
        else:
            return [
                self.getRowByIndex(i)[0]
                for i in range(self.getNumRows())
            ]
Return a list with the DataFrame data.