def execute(self):
        self.surface_area = 4.0*pi*self.radius*self.radius
        self.inner_volume = 4.0/3.0*pi*self.radius**3
        self.volume = 4.0/3.0*pi*(self.radius+self.thickness)**3
        self.solid_volume = self.inner_volume-self.volume
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/test/test_distsim.py/HollowSphere.execute/swapped operands of `-`