Remove redundant code

Change-Id: Ib15b301da60bcc8d0240d31c04d1cc7aae713702

Author: liym27

python/paddle/fluid/dygraph/varbase_patch_methods.py

@@ -12,9 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import six
 import inspect
-
 from .. import framework
 from .. import core
 from ..framework import Variable, Parameter, ParamBase

python/paddle/fluid/tests/unittests/test_imperative_basic.py

@@ -600,49 +600,6 @@ def test_layer_attrs(self):
         my_layer.l1 = None
         self.assertEqual(len(my_layer.sublayers()), 0)
 
-    def test_varbase_setitem(self):
-        paddle.disable_static()
-
-        tensor_a = paddle.to_tensor(np.ones((4, 2, 3)).astype(np.float32))
-
-        np_value_b = np.random.random((2, 3)).astype(np.float32)
-        id_a_origin = id(tensor_a)
-
-        self.assertFalse(np.array_equal(tensor_a[0].numpy(), np_value_b))
-        tensor_a[0] = np_value_b
-        self.assertTrue(np.array_equal(tensor_a[0].numpy(), np_value_b))
-        id_a_new_1 = id(tensor_a)
-
-        var_b = paddle.to_tensor(np_value_b)
-        self.assertFalse(np.array_equal(tensor_a[1].numpy(), np_value_b))
-        tensor_a[1] = var_b
-        self.assertTrue(np.array_equal(tensor_a[1].numpy(), var_b.numpy()))
-        id_a_new_2 = id(tensor_a)
-
-        tensor_a[0] = 10
-        self.assertTrue(
-            np.array_equal(tensor_a[0].numpy(),
-                           np.zeros_like(var_b.numpy()) + 10))
-        id_a_new_3 = id(tensor_a)
-
-        tensor_a[2:3] = var_b
-        self.assertTrue(np.array_equal(tensor_a[2].numpy(), var_b.numpy()))
-        id_a_new_4 = id(tensor_a)
-
-        tensor_a[...] = np.ones([2, 3])
-        self.assertTrue(np.array_equal(tensor_a.numpy(), np.ones([4, 2, 3])))
-        id_a_new_5 = id(tensor_a)
-
-        self.assertEqual(id_a_origin, id_a_new_1)
-        self.assertEqual(id_a_origin, id_a_new_2)
-        self.assertEqual(id_a_origin, id_a_new_3)
-        self.assertEqual(id_a_origin, id_a_new_4)
-        self.assertEqual(id_a_origin, id_a_new_5)
-
-        with self.assertRaisesRegex(
-                TypeError, "Assignment to a Variable only accepts a Variable"):
-            tensor_a[0] = "1"
-
 
 class TestDygraphUtils(unittest.TestCase):
     def test_append_activation_in_dygraph_exception(self):