Method __sub__

numpy/core/tests/test_function_base.py:20–22

(self, x)

    __radd__ = __add__

    def __sub__(self, x):
        assert_(isinstance(x, PhysicalQuantity))
        return PhysicalQuantity(float(self) - float(x))

    def __rsub__(self, x):
        assert_(isinstance(x, PhysicalQuantity))