test_eval.py 文件源码

def test_pow_eval():
    # XXX Pow does not fully support conversion of negative numbers
    #     to their complex equivalent

    assert sqrt(-1) == I

    assert sqrt(-4) == 2*I
    assert sqrt( 4) == 2
    assert (8)**Rational(1, 3) == 2
    assert (-8)**Rational(1, 3) == 2*((-1)**Rational(1, 3))

    assert sqrt(-2) == I*sqrt(2)
    assert (-1)**Rational(1, 3) != I
    assert (-10)**Rational(1, 3) != I*((10)**Rational(1, 3))
    assert (-2)**Rational(1, 4) != (2)**Rational(1, 4)

    assert 64**Rational(1, 3) == 4
    assert 64**Rational(2, 3) == 16
    assert 24/sqrt(64) == 3
    assert (-27)**Rational(1, 3) == 3*(-1)**Rational(1, 3)

    assert (cos(2) / tan(2))**2 == (cos(2) / tan(2))**2