diff --git a/python/pipeline/error_catch.py b/python/pipeline/error_catch.py
index df5396665697cd75c1cb02afa01198e502884acc..9663841db9c70e17b2de6b03e84015d0f7c9633c 100644
--- a/python/pipeline/error_catch.py
+++ b/python/pipeline/error_catch.py
@@ -217,7 +217,7 @@ class ParamVerify(object):
 
     @staticmethod
     def check_fetch_list(fetch_list, right_fetch_list):
-        if len(fetch_list) ==0 :
+        if len(fetch_list) == 0:
             return True
         if not isinstance(fetch_list, list):
             return False