diff --git a/tests/python_client/utils/utils.py b/tests/python_client/utils/utils.py
index 3746702aaf..3a15d9cc47 100644
--- a/tests/python_client/utils/utils.py
+++ b/tests/python_client/utils/utils.py
@@ -1,9 +1,5 @@
-import os
-import sys
 import random
-import pdb
 import string
-import struct
 import logging
 import threading
 import traceback
@@ -68,8 +64,10 @@ default_index_params = [
     {"nlist": 128}
 ]
 
-def create_target_index(index,field_name):
-    index["field_name"]=field_name
+
+def create_target_index(index, field_name):
+    index["field_name"] = field_name
+
 
 def index_cpu_not_support():
     return ["IVF_SQ8_HYBRID"]
@@ -1021,5 +1019,3 @@ class MyThread(threading.Thread):
         super(MyThread, self).join()
         if self.exc:
             raise self.exc
-
-