test_classes.py 文件源码

def check_pow(Poly):
    d = Poly.domain + random((2,))*.25
    w = Poly.window + random((2,))*.25
    tgt = Poly([1], domain=d, window=w)
    tst = Poly([1, 2, 3], domain=d, window=w)
    for i in range(5):
        assert_poly_almost_equal(tst**i, tgt)
        tgt = tgt * tst
    # default domain and window
    tgt = Poly([1])
    tst = Poly([1, 2, 3])
    for i in range(5):
        assert_poly_almost_equal(tst**i, tgt)
        tgt = tgt * tst
    # check error for invalid powers
    assert_raises(ValueError, op.pow, tgt, 1.5)
    assert_raises(ValueError, op.pow, tgt, -1)