diff --git a/tests/python_test/collection/test_load_collection.py b/tests/python_test/collection/test_load_collection.py
index 779475286d..78a19ba9bd 100644
--- a/tests/python_test/collection/test_load_collection.py
+++ b/tests/python_test/collection/test_load_collection.py
@@ -297,9 +297,9 @@ class TestReleaseAdvanced:
         connect.insert(collection, default_entities)
         connect.flush([collection])
 
-        def load(collection):
+        def load():
             connect.load_collection(collection)
-        t = threading.Thread(target=load, (collection, ))
+        t = threading.Thread(target=load, args=())
         t.start()
         connect.release_collection(collection)
         res = connect.search(collection, default_single_query)
@@ -315,9 +315,9 @@ class TestReleaseAdvanced:
         connect.insert(collection, default_entities, partition_tag=default_tag)
         connect.flush([collection])
 
-        def load(collection):
+        def load():
             connect.load_collection(collection)
-        t = threading.Thread(target=load, (collection, ))
+        t = threading.Thread(target=load, args=())
         t.start()
         connect.release_partitions(collection, [default_tag])
         res = connect.search(collection, default_single_query)
@@ -333,9 +333,9 @@ class TestReleaseAdvanced:
         connect.flush([collection])
         connect.load_collection(collection)
 
-        def insert(collection):
+        def insert():
             connect.insert(collection, default_entities)
-        t = threading.Thread(target=insert, (collection, ))
+        t = threading.Thread(target=insert, args=())
         t.start()
         connect.release_collection(collection)
         res = connect.search(collection, default_single_query)
diff --git a/tests/python_test/entity/test_insert.py b/tests/python_test/entity/test_insert.py
index 6dececd445..bbbc478a0d 100644
--- a/tests/python_test/entity/test_insert.py
+++ b/tests/python_test/entity/test_insert.py
@@ -876,9 +876,9 @@ class TestInsertMultiCollections:
             connect.insert(collection, default_entities)
         connect.flush([collection])
         connect.load_collection(collection)
-        def release(collection):
+        def release():
             connect.release_collection(collection)
-        t = threading.Thread(target=release, (collection, ))
+        t = threading.Thread(target=release, args=())
         t.start()
         ids = connect.insert(collection, default_entities)
         assert len(ids) == default_nb
diff --git a/tests/python_test/test_connect.py b/tests/python_test/test_connect.py
index 9d4dc5a1b8..46d7131b88 100644
--- a/tests/python_test/test_connect.py
+++ b/tests/python_test/test_connect.py
@@ -28,7 +28,7 @@ class TestConnect:
         '''
         res = connect.close()
         with pytest.raises(Exception) as e:
-            res = connect.()
+            res = connect.list_collections()
 
     # TODO: remove
     def _test_disconnect_repeatedly(self, dis_connect, args):
diff --git a/tests/python_test/utils.py b/tests/python_test/utils.py
index 1b214458fc..7ad9893f3c 100644
--- a/tests/python_test/utils.py
+++ b/tests/python_test/utils.py
@@ -6,6 +6,7 @@ import string
 import struct
 import logging
 import threading
+import traceback
 import time
 import copy
 import numpy as np
@@ -994,6 +995,7 @@ class TestThread(threading.Thread):
             super(TestThread, self).run()
         except BaseException as e:
             self.exc = e
+            logging.error(traceback.format_exc())
 
     def join(self):
         super(TestThread, self).join()