test_math.py 文件源码

def testTanh(self):
        self.assertRaises(TypeError, math.tanh)
        self.ftest('tanh(0)', math.tanh(0), 0)
        self.ftest('tanh(1)+tanh(-1)', math.tanh(1)+math.tanh(-1), 0)
        self.ftest('tanh(inf)', math.tanh(INF), 1)
        self.ftest('tanh(-inf)', math.tanh(NINF), -1)
        self.assertTrue(math.isnan(math.tanh(NAN)))
        # check that tanh(-0.) == -0. on IEEE 754 systems
        if float.__getformat__("double").startswith("IEEE"):
            self.assertEqual(math.tanh(-0.), -0.)
            self.assertEqual(math.copysign(1., math.tanh(-0.)),
                             math.copysign(1., -0.))