@property
    def speed(self):
        return 1/sqrt(self._permittivity*self._permeability)
Test fallbacks for __typeof with multi-value virtual field
dataset/ETHPy150Open sympy/sympy/sympy/physics/optics/medium.py/Medium.speed--crossover with--dataset/ETHPy150Open sahana/eden/modules/unit_tests/s3/s3hierarchy.py/S3TypeOfTests.testVirtualFieldMultiple