diff --git a/python/rocketmq/client_id_encoder.py b/python/rocketmq/client_id_encoder.py
index cbab96684..138b05f02 100644
--- a/python/rocketmq/client_id_encoder.py
+++ b/python/rocketmq/client_id_encoder.py
@@ -13,10 +13,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import threading
-import socket
 import os
+import socket
+import threading
 import time
+
 import rocketmq.utils
 
 
diff --git a/python/rocketmq/client_manager.py b/python/rocketmq/client_manager.py
index d4a78bb6e..dd13b2f51 100644
--- a/python/rocketmq/client_manager.py
+++ b/python/rocketmq/client_manager.py
@@ -13,11 +13,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from rocketmq.rpc_client import Endpoints, RpcClient
-from rocketmq.client import Client
-from protocol import service_pb2
 import threading
 
+from protocol import service_pb2
+from rocketmq.client import Client
+from rocketmq.rpc_client import Endpoints, RpcClient
+
 
 class ClientManager:
     def __init__(self, client: Client):
diff --git a/python/rocketmq/message.py b/python/rocketmq/message.py
index 40ad9be3b..f20e86510 100644
--- a/python/rocketmq/message.py
+++ b/python/rocketmq/message.py
@@ -116,10 +116,6 @@ def properties(self):
     def tag(self):
         return self.__tag
 
-    @property
-    def keys(self):
-        return self.__keys
-
     @property
     def message_group(self):
         return self.__message_group
diff --git a/python/rocketmq/signature.py b/python/rocketmq/signature.py
index e00cf543f..c77a355a2 100644
--- a/python/rocketmq/signature.py
+++ b/python/rocketmq/signature.py
@@ -13,10 +13,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from rocketmq.client_config import ClientConfig
-import uuid
 import datetime
 import importlib.metadata
+import uuid
+
+from rocketmq.client_config import ClientConfig
 from rocketmq.utils import sign
 
 
diff --git a/python/rocketmq/utils.py b/python/rocketmq/utils.py
index d021a8494..adec636be 100644
--- a/python/rocketmq/utils.py
+++ b/python/rocketmq/utils.py
@@ -13,16 +13,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import hmac
 import hashlib
+import hmac
 
-from apscheduler.executors.pool import ThreadPoolExecutor, ProcessPoolExecutor
-from multiprocessing import cpu_count
-
-scheduler_executors = {
-    'default': ThreadPoolExecutor(2 * cpu_count()),
-    # 'processpool': ProcessPoolExecutor(5)
-}
 
 def number_to_base(number, base):
     alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"