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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def area(self, by_spec=False):
 """ Calculate the total area of the referenced cell with the magnification factor included. Parameters by_spec : bool If ``True``, the return value is a dictionary with the areas of each individual pair (layer, datatype). Returns ------- out : number, dictionary Area of this cell. """

        if not isinstance(self.ref_cell, Cell):
            return dict() if by_spec else 0
        if self.magnification is None:
            return self.ref_cell.area(by_spec)
        else:
            if by_spec:
                factor = self.magnification**2
                cell_area = self.ref_cell.area(True)
                for kk in cell_area.keys():
                    cell_area[kk] *= factor
                return cell_area
            else:
                return self.ref_cell.area() * self.magnification**2