diff --git a/tests/st/control/test_cont_break.py b/tests/st/control/test_cont_break.py
index faced4e426..361ddb6651 100644
--- a/tests/st/control/test_cont_break.py
+++ b/tests/st/control/test_cont_break.py
@@ -42,7 +42,6 @@ class for_loop_with_break(Cell):
                 x *= 3
                 break
             x = x * 2
-            pass
         return x
 
 
@@ -71,9 +70,7 @@ class for_loop_with_cont_break(Cell):
             if i > 5:
                 x *= 3
                 break
-                x *= 2
             x = x * 2
-            pass
         return x
 
 
@@ -82,7 +79,7 @@ class for_nested_loop_with_break(Cell):
         super().__init__()
 
     def construct(self, x):
-        for i in range(3):
+        for _ in range(3):
             for j in range(5):
                 if j > 3:
                     x *= 2
diff --git a/tests/st/control/test_while.py b/tests/st/control/test_while.py
index f753052cf6..548c866a20 100644
--- a/tests/st/control/test_while.py
+++ b/tests/st/control/test_while.py
@@ -12,13 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-import numpy as np
-
 import mindspore.context as context
-import mindspore.nn as nn
 from mindspore import Tensor, ms_function
 from mindspore.common import dtype as mstype
-from mindspore.ops import operations as P
 
 
 @ms_function
@@ -37,7 +33,7 @@ def test_net():
     c3 = Tensor([1], mstype.int32)
     expect = Tensor([21], mstype.int32)
     ret = t1_while(c1, c2, c3)
-    assert (ret == expect)
+    assert ret == expect
 
 
 if __name__ == "__main__":
diff --git a/tests/st/fusion/test_add_relu_buffer_fusion.py b/tests/st/fusion/test_add_relu_buffer_fusion.py
index 4a428beaf0..215e592735 100644
--- a/tests/st/fusion/test_add_relu_buffer_fusion.py
+++ b/tests/st/fusion/test_add_relu_buffer_fusion.py
@@ -17,7 +17,7 @@ import numpy as np
 import mindspore.common.dtype as mstype
 import mindspore.context as context
 import mindspore.nn as nn
-from mindspore import Tensor, ms_function
+from mindspore import Tensor
 from mindspore.ops import operations as P
 
 context.set_context(mode=context.GRAPH_MODE, device_id=5, device_target="Ascend")
diff --git a/tests/st/fusion/test_conv_bn1_fusion.py b/tests/st/fusion/test_conv_bn1_fusion.py
index 79d8f08cea..905179ee30 100644
--- a/tests/st/fusion/test_conv_bn1_fusion.py
+++ b/tests/st/fusion/test_conv_bn1_fusion.py
@@ -16,10 +16,8 @@ import numpy as np
 
 import mindspore.context as context
 import mindspore.nn as nn
-from mindspore import Tensor, Parameter, Model, ms_function
-from mindspore.common.initializer import initializer
+from mindspore import Tensor, Model, ms_function
 from mindspore.nn.loss import SoftmaxCrossEntropyWithLogits
-from mindspore.nn.optim import Momentum
 from mindspore.ops import operations as P
 
 context.set_context(device_target="Ascend")
diff --git a/tests/st/mem_reuse/check_file.py b/tests/st/mem_reuse/check_file.py
index 152dfebe79..5359ccea3e 100644
--- a/tests/st/mem_reuse/check_file.py
+++ b/tests/st/mem_reuse/check_file.py
@@ -19,8 +19,8 @@ curr_path = os.path.abspath(os.curdir)
 file_memreuse = curr_path + "/mem_reuse_check/memreuse.ir"
 file_normal = curr_path + "/mem_reuse_check/normal_mem.ir"
 checker = os.path.exists(file_memreuse)
-assert (checker, True)
+assert checker == True
 checker = os.path.exists(file_normal)
-assert (checker, True)
+assert checker == True
 checker = filecmp.cmp(file_memreuse, file_normal)
-assert (checker, True)
+assert checker == True
diff --git a/tests/st/mem_reuse/resnet_cifar_memreuse.py b/tests/st/mem_reuse/resnet_cifar_memreuse.py
index 93ee5f8393..0ce602bde7 100644
--- a/tests/st/mem_reuse/resnet_cifar_memreuse.py
+++ b/tests/st/mem_reuse/resnet_cifar_memreuse.py
@@ -12,10 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-import argparse
-import numpy as np
 import os
 import random
+import argparse
+import numpy as np
 from resnet import resnet50
 
 import mindspore.common.dtype as mstype
@@ -31,7 +31,6 @@ from mindspore.ops import functional as F
 from mindspore.ops import operations as P
 from mindspore.train.callback import ModelCheckpoint, CheckpointConfig, LossMonitor
 from mindspore.train.model import Model, ParallelMode
-from mindspore.train.serialization import load_checkpoint, load_param_into_net
 
 random.seed(1)
 np.random.seed(1)
@@ -143,11 +142,8 @@ if __name__ == '__main__':
         model.train(epoch_size, dataset, callbacks=[ckpoint_cb, loss_cb])
 
     if args_opt.do_eval:
-        # if args_opt.checkpoint_path:
-        #     param_dict = load_checkpoint(args_opt.checkpoint_path)
-        #     load_param_into_net(net, param_dict)
         eval_dataset = create_dataset(1, training=False)
         res = model.eval(eval_dataset)
         print("result: ", res)
     checker = os.path.exists("./memreuse.ir")
-    assert (checker, True)
+    assert checker == True
diff --git a/tests/st/mem_reuse/resnet_cifar_normal.py b/tests/st/mem_reuse/resnet_cifar_normal.py
index aa2262d223..1d61cb2188 100644
--- a/tests/st/mem_reuse/resnet_cifar_normal.py
+++ b/tests/st/mem_reuse/resnet_cifar_normal.py
@@ -12,10 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-import argparse
-import numpy as np
 import os
 import random
+import argparse
+import numpy as np
 from resnet import resnet50
 
 import mindspore.common.dtype as mstype
@@ -31,7 +31,6 @@ from mindspore.ops import functional as F
 from mindspore.ops import operations as P
 from mindspore.train.callback import ModelCheckpoint, CheckpointConfig, LossMonitor
 from mindspore.train.model import Model, ParallelMode
-from mindspore.train.serialization import load_checkpoint, load_param_into_net
 
 random.seed(1)
 np.random.seed(1)
@@ -143,11 +142,8 @@ if __name__ == '__main__':
         model.train(epoch_size, dataset, callbacks=[ckpoint_cb, loss_cb])
 
     if args_opt.do_eval:
-        # if args_opt.checkpoint_path:
-        #     param_dict = load_checkpoint(args_opt.checkpoint_path)
-        #     load_param_into_net(net, param_dict)
         eval_dataset = create_dataset(1, training=False)
         res = model.eval(eval_dataset)
         print("result: ", res)
     checker = os.path.exists("./normal_memreuse.ir")
-    assert (checker, True)
+    assert checker == True
diff --git a/tests/st/nccl/test_nccl_all.py b/tests/st/nccl/test_nccl_all.py
index 2ad160fab3..adb662969c 100644
--- a/tests/st/nccl/test_nccl_all.py
+++ b/tests/st/nccl/test_nccl_all.py
@@ -21,7 +21,7 @@ import pytest
 @pytest.mark.env_single
 def test_nccl_lenet():
     return_code = os.system("mpirun -n 8 pytest -s test_nccl_lenet.py")
-    assert (return_code == 0)
+    assert return_code == 0
 
 
 @pytest.mark.level0
@@ -29,7 +29,7 @@ def test_nccl_lenet():
 @pytest.mark.env_single
 def test_nccl_all_reduce_op():
     return_code = os.system("mpirun -n 8 pytest -s test_nccl_all_reduce_op.py")
-    assert (return_code == 0)
+    assert return_code == 0
 
 
 @pytest.mark.level0
@@ -37,7 +37,7 @@ def test_nccl_all_reduce_op():
 @pytest.mark.env_single
 def test_nccl_all_gather_op():
     return_code = os.system("mpirun -n 8 pytest -s test_nccl_all_gather_op.py")
-    assert (return_code == 0)
+    assert return_code == 0
 
 
 @pytest.mark.level0
@@ -45,4 +45,4 @@ def test_nccl_all_gather_op():
 @pytest.mark.env_single
 def test_nccl_reduce_scatter_op():
     return_code = os.system("mpirun -n 8 pytest -s test_nccl_reduce_scatter_op.py")
-    assert (return_code == 0)
+    assert return_code == 0
diff --git a/tests/st/nccl/test_nccl_all_gather_op.py b/tests/st/nccl/test_nccl_all_gather_op.py
index 5fb71d9ce5..36c2ccd29d 100644
--- a/tests/st/nccl/test_nccl_all_gather_op.py
+++ b/tests/st/nccl/test_nccl_all_gather_op.py
@@ -51,4 +51,4 @@ def test_AllGather():
     diff = output.asnumpy() - expect
     error = np.ones(shape=expect.shape) * 1.0e-5
     assert np.all(diff < error)
-    assert (output.shape() == expect.shape)
+    assert output.shape() == expect.shape
diff --git a/tests/st/nccl/test_nccl_lenet.py b/tests/st/nccl/test_nccl_lenet.py
index a5d7f2e3b4..ff7def2d72 100644
--- a/tests/st/nccl/test_nccl_lenet.py
+++ b/tests/st/nccl/test_nccl_lenet.py
@@ -19,7 +19,7 @@ import mindspore.context as context
 import mindspore.nn as nn
 from mindspore import Tensor
 from mindspore.common import dtype as mstype
-from mindspore.communication.management import init, get_rank, get_group_size
+from mindspore.communication.management import init, get_group_size
 from mindspore.nn import TrainOneStepCell, WithLossCell
 from mindspore.nn.optim import Momentum
 from mindspore.ops import operations as P
@@ -94,8 +94,8 @@ def test_lenet_nccl():
     data = Tensor(np.ones([net.batch_size, 3, 32, 32]).astype(np.float32) * 0.01)
     label = Tensor(np.ones([net.batch_size]).astype(np.int32))
     start = datetime.datetime.now()
-    for i in range(epoch):
-        for step in range(mini_batch):
+    for _ in range(epoch):
+        for _ in range(mini_batch):
             loss = train_network(data, label)
             losses.append(loss.asnumpy())
     end = datetime.datetime.now()
@@ -105,4 +105,4 @@ def test_lenet_nccl():
     with open("ms_loss.txt", "w") as fo2:
         fo2.write("loss:")
         fo2.write(str(losses[-5:]))
-    assert (losses[-1] < 0.01)
+    assert losses[-1] < 0.01
diff --git a/tests/st/nccl/test_nccl_reduce_scatter_op.py b/tests/st/nccl/test_nccl_reduce_scatter_op.py
index 8409d947af..c3e1903883 100644
--- a/tests/st/nccl/test_nccl_reduce_scatter_op.py
+++ b/tests/st/nccl/test_nccl_reduce_scatter_op.py
@@ -54,23 +54,23 @@ def test_ReduceScatter():
     reduce_scatter = Net()
     output = reduce_scatter()
 
-    sum = np.ones([size, 1, 3, 3]).astype(np.float32) * 0
+    sum_ones = np.ones([size, 1, 3, 3]).astype(np.float32) * 0
     for i in range(size):
-        sum += np.ones([size, 1, 3, 3]).astype(np.float32) * 0.01 * (i + 1)
-    expect0 = sum[rank: rank + 1]
+        sum_ones += np.ones([size, 1, 3, 3]).astype(np.float32) * 0.01 * (i + 1)
+    expect0 = sum_ones[rank: rank + 1]
     diff0 = output[0].asnumpy() - expect0
     error0 = np.ones(shape=expect0.shape) * 1.0e-5
     assert np.all(diff0 < error0)
-    assert (output[0].shape() == expect0.shape)
+    assert output[0].shape() == expect0.shape
 
     expect1 = np.ones([1, 1, 3, 3]).astype(np.float32) * 0.01 * size
     diff1 = output[1].asnumpy() - expect1
     error1 = np.ones(shape=expect1.shape) * 1.0e-5
     assert np.all(diff1 < error1)
-    assert (output[1].shape() == expect1.shape)
+    assert output[1].shape() == expect1.shape
 
     expect2 = np.ones([1, 1, 3, 3]).astype(np.float32) * 0.01 * 1
     diff2 = output[2].asnumpy() - expect2
     error2 = np.ones(shape=expect2.shape) * 1.0e-5
     assert np.all(diff2 < error2)
-    assert (output[2].shape() == expect2.shape)
+    assert output[2].shape() == expect2.shape
diff --git a/tests/st/networks/models/alexnet.py b/tests/st/networks/models/alexnet.py
index a31182a832..bb11954fdb 100644
--- a/tests/st/networks/models/alexnet.py
+++ b/tests/st/networks/models/alexnet.py
@@ -13,7 +13,6 @@
 # limitations under the License.
 # ============================================================================
 import mindspore.nn as nn
-from mindspore.nn import Dense
 from mindspore.ops import operations as P
 
 
diff --git a/tests/st/networks/models/bert/bert_tdt_lossscale.py b/tests/st/networks/models/bert/bert_tdt_lossscale.py
index ec9b711cd9..5d530851ab 100644
--- a/tests/st/networks/models/bert/bert_tdt_lossscale.py
+++ b/tests/st/networks/models/bert/bert_tdt_lossscale.py
@@ -15,10 +15,9 @@
 
 """train bert network without lossscale"""
 
-import numpy as np
 import os
 import pytest
-from numpy import allclose
+import numpy as np
 
 import mindspore.common.dtype as mstype
 import mindspore.dataset.engine.datasets as de
@@ -28,7 +27,7 @@ from mindspore import log as logger
 from mindspore.common.tensor import Tensor
 from mindspore.model_zoo.Bert_NEZHA import BertConfig, BertNetworkWithLoss, BertTrainOneStepWithLossScaleCell
 from mindspore.nn.optim import Momentum
-from mindspore.train.callback import Callback, LossMonitor
+from mindspore.train.callback import Callback
 from mindspore.train.loss_scale_manager import DynamicLossScaleManager
 from mindspore.train.model import Model
 
diff --git a/tests/st/networks/models/lenet.py b/tests/st/networks/models/lenet.py
index 5f95145e17..ce0932ca21 100644
--- a/tests/st/networks/models/lenet.py
+++ b/tests/st/networks/models/lenet.py
@@ -12,11 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-import numpy as np
-
 import mindspore.nn as nn
-from mindspore import Tensor
-from mindspore.nn import Dense
 from mindspore.ops import operations as P
 
 
diff --git a/tests/st/pynative/test_ascend_lenet.py b/tests/st/pynative/test_ascend_lenet.py
index 284a3235cf..021c71d9cd 100644
--- a/tests/st/pynative/test_ascend_lenet.py
+++ b/tests/st/pynative/test_ascend_lenet.py
@@ -12,10 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-import math
+import time
 import numpy as np
 import pytest
-import time
 
 import mindspore.nn as nn
 from mindspore import context, Tensor, ParameterTuple
@@ -152,10 +151,10 @@ def test_ascend_pynative_lenet():
         fw_output = net(inputs)
         loss_output = criterion(fw_output, labels)
         grads = train_network(inputs, labels)
-        success = optimizer(grads)
+        optimizer(grads)
         end_time = time.time()
         cost_time = end_time - start_time
         total_time = total_time + cost_time
 
         print("======epoch: ", epoch, " loss: ", loss_output.asnumpy(), " cost time: ", cost_time)
-    assert (loss_output.asnumpy() < 0.1)
+    assert loss_output.asnumpy() < 0.1
diff --git a/tests/st/summary/test_davinci_summary.py b/tests/st/summary/test_davinci_summary.py
index e12bc25f5e..96fa2fe899 100644
--- a/tests/st/summary/test_davinci_summary.py
+++ b/tests/st/summary/test_davinci_summary.py
@@ -13,18 +13,15 @@
 # limitations under the License.
 # ============================================================================
 """ test model train """
-import numpy as np
 import os
+import numpy as np
 from apply_momentum import ApplyMomentum
-
 import mindspore.context as context
 import mindspore.nn as nn
 import mindspore.nn as wrap
-from mindspore import Tensor, Parameter, Model
+from mindspore import Tensor, Model
 from mindspore.common.api import ms_function
-from mindspore.common.initializer import initializer
 from mindspore.nn.loss import SoftmaxCrossEntropyWithLogits
-from mindspore.nn.optim import Momentum
 from mindspore.ops import operations as P
 from mindspore.train.summary.summary_record import SummaryRecord
 
diff --git a/tests/st/summary/test_gpu_summary.py b/tests/st/summary/test_gpu_summary.py
index 455941fd9b..7712b213a2 100644
--- a/tests/st/summary/test_gpu_summary.py
+++ b/tests/st/summary/test_gpu_summary.py
@@ -12,12 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-import numpy as np
 import os
-import pytest
 import random
 import shutil
-import time
+import pytest
+import numpy as np
 
 import mindspore.context as context
 import mindspore.nn as nn
@@ -76,7 +75,7 @@ class SummaryNet(nn.Cell):
         return z
 
 
-def train_summary_record_scalar_for_1(test_writer, steps, fwd_x, fwd_y):
+def train_summary_record_scalar_for_1(test_writer, steps):
     net = SummaryNet()
     out_me_dict = {}
     for i in range(0, steps):
@@ -89,12 +88,9 @@ def train_summary_record_scalar_for_1(test_writer, steps, fwd_x, fwd_y):
     return out_me_dict
 
 
-def me_scalar_summary(steps, tag=None, value=None):
+def me_scalar_summary(steps):
     with SummaryRecord(SUMMARY_DIR_ME_TEMP) as test_writer:
-        x = Tensor(np.array([1.1]).astype(np.float32))
-        y = Tensor(np.array([1.2]).astype(np.float32))
-
-        out_me_dict = train_summary_record_scalar_for_1(test_writer, steps, x, y)
+        out_me_dict = train_summary_record_scalar_for_1(test_writer, steps)
 
         return out_me_dict
 
diff --git a/tests/st/tbe_networks/export_geir.py b/tests/st/tbe_networks/export_geir.py
index f709d52b3d..a8589eefb6 100644
--- a/tests/st/tbe_networks/export_geir.py
+++ b/tests/st/tbe_networks/export_geir.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 # ============================================================================
 import numpy as np
-import os
+
 from resnet_torch import resnet50
 
 from mindspore import Tensor
diff --git a/tests/st/tbe_networks/resnet_cifar.py b/tests/st/tbe_networks/resnet_cifar.py
index 42a767d228..39858d4f33 100644
--- a/tests/st/tbe_networks/resnet_cifar.py
+++ b/tests/st/tbe_networks/resnet_cifar.py
@@ -12,10 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ============================================================================
-import argparse
-import numpy as np
 import os
 import random
+import argparse
+import numpy as np
 from resnet import resnet50
 
 import mindspore.common.dtype as mstype
diff --git a/tests/st/tbe_networks/test_resnet_cifar_1p.py b/tests/st/tbe_networks/test_resnet_cifar_1p.py
index 5d8c9578ef..3193382527 100644
--- a/tests/st/tbe_networks/test_resnet_cifar_1p.py
+++ b/tests/st/tbe_networks/test_resnet_cifar_1p.py
@@ -13,11 +13,11 @@
 # limitations under the License.
 # ============================================================================
 
-import numpy as np
 import os
-import pytest
 import random
 import time
+import pytest
+import numpy as np
 from resnet import resnet50
 
 import mindspore.common.dtype as mstype
@@ -134,7 +134,7 @@ class LossGet(Callback):
         return self._loss
 
 
-def train_process(device_id, epoch_size, num_classes, device_num, batch_size):
+def train_process(device_id, epoch_size, num_classes, batch_size):
     os.system("mkdir " + str(device_id))
     os.chdir(str(device_id))
     context.set_context(mode=context.GRAPH_MODE, device_target="Ascend")
@@ -181,15 +181,14 @@ def eval(batch_size, num_classes):
 @pytest.mark.platform_x86_ascend_training
 @pytest.mark.env_onecard
 def test_resnet_cifar_1p():
-    device_num = 1
     epoch_size = 1
     num_classes = 10
     batch_size = 32
     device_id = 0
-    train_process(device_id, epoch_size, num_classes, device_num, batch_size)
+    train_process(device_id, epoch_size, num_classes, batch_size)
     time.sleep(3)
     acc = eval(batch_size, num_classes)
     os.chdir("../")
     os.system("rm -rf " + str(device_id))
     print("End training...")
-    assert (acc['acc'] > 0.35)
+    assert acc['acc'] > 0.35
diff --git a/tests/st/tbe_networks/test_resnet_cifar_8p.py b/tests/st/tbe_networks/test_resnet_cifar_8p.py
index c27ce14c1b..63c82a8bd0 100644
--- a/tests/st/tbe_networks/test_resnet_cifar_8p.py
+++ b/tests/st/tbe_networks/test_resnet_cifar_8p.py
@@ -13,10 +13,10 @@
 # limitations under the License.
 # ============================================================================
 
-import numpy as np
 import os
-import pytest
 import random
+import numpy as np
+import pytest
 from multiprocessing import Process, Queue
 from resnet import resnet50
 
@@ -168,7 +168,7 @@ def train_process(q, device_id, epoch_size, num_classes, device_num, batch_size,
     dataset = create_dataset(epoch_size, training=True,
                              batch_size=batch_size, rank_id=device_id, rank_size=device_num,
                              enable_hccl=enable_hccl)
-    batch_num = dataset.get_dataset_size()
+
     loss_cb = LossGet()
     model.train(epoch_size, dataset, callbacks=[loss_cb])
     q.put(loss_cb.get_loss())
@@ -207,4 +207,4 @@ def test_resnet_cifar_8p():
     for i in range(device_num):
         os.system("rm -rf " + str(i))
     print("End training...")
-    assert (loss < 2.0)
+    assert loss < 2.0