python3断言

import  unittestdef div(a,b):    return  a / bclass TestDiv(unittest.TestCase):    def test_1_div_1(self):        self.assertEqual(div(1,1),1/1)    def test_3_div_4(self):        self.assertEqual(div(3,4),3/4)    def test_3_div_0(self):        self.assertRaises(ZeroDivisionError,div,3,0)if __name__ == '__main__':    unittest.main()