lens.py 文件源码

def distance(self, new_distance):
        if not isinstance(new_distance, u.Quantity):
            self._distance = new_distance * 1000. * u.pc
        else:
            if new_distance.unit.physical_type != 'distance':
                TypeError('Wrong type of new_distance!')
            if (new_distance.unit == "pc") or (new_distance.unit == "kpc"):
                self._distance = new_distance
            else:
                raise u.UnitsError(
                    'Allowed units for Lens distance are "pc" or "kpc"')