test_classes.py 文件源码

def check_sub(Poly):
    # This checks commutation, not numerical correctness
    c1 = list(random((4,)) + .5)
    c2 = list(random((3,)) + .5)
    p1 = Poly(c1)
    p2 = Poly(c2)
    p3 = p1 - p2
    assert_poly_almost_equal(p2 - p1, -p3)
    assert_poly_almost_equal(p1 - c2, p3)
    assert_poly_almost_equal(c2 - p1, -p3)
    assert_poly_almost_equal(p1 - tuple(c2), p3)
    assert_poly_almost_equal(tuple(c2) - p1, -p3)
    assert_poly_almost_equal(p1 - np.array(c2), p3)
    assert_poly_almost_equal(np.array(c2) - p1, -p3)
    assert_raises(TypeError, op.sub, p1, Poly([0], domain=Poly.domain + 1))
    assert_raises(TypeError, op.sub, p1, Poly([0], window=Poly.window + 1))
    if Poly is Polynomial:
        assert_raises(TypeError, op.sub, p1, Chebyshev([0]))
    else:
        assert_raises(TypeError, op.sub, p1, Polynomial([0]))