def test_false(self): self.assertFalse(is_binary3("111"))
def test_true(self): self.assertTrue(is_binary3("110"))
def test_letters(self): self.assertFalse(is_binary3("abc"))
def test_space(self): self.assertFalse(is_binary3(" 0"))
def test_zero(self): self.assertTrue(is_binary3("000"))