diff --git a/tests/system-test/2-query/csum.py b/tests/system-test/2-query/csum.py
index 5bd1d4d45e6fea063d3463d793ca3219e57a7a96..708aa351830e6c088f39e546138ee2e518921ce3 100644
--- a/tests/system-test/2-query/csum.py
+++ b/tests/system-test/2-query/csum.py
@@ -419,7 +419,7 @@ class TDTestCase:
         tdSql.checkData(3,0,4)
         tdSql.query("select csum(abs(c1))+2 from t1 ")
         tdSql.checkRows(4)
-    
+
     def csum_support_stable(self):
         tdSql.query(" select csum(1) from stb1 ")
         tdSql.checkRows(70)
@@ -434,17 +434,17 @@ class TDTestCase:
         tdSql.query("select csum(st1+c1) from stb1 partition by tbname")
         tdSql.checkRows(40)
 
-        # # bug need fix 
+        # # bug need fix
         # tdSql.query("select csum(st1+c1) from stb1 partition by tbname slimit 1 ")
         # tdSql.checkRows(4)
         # tdSql.error("select csum(st1+c1) from stb1 partition by tbname limit 1 ")
 
 
-        # bug need fix 
+        # bug need fix
         tdSql.query("select csum(st1+c1) from stb1 partition by tbname")
-        tdSql.checkRows(40)        
+        tdSql.checkRows(40)
 
-        # bug need fix 
+        # bug need fix
         # tdSql.query("select tbname , csum(c1) from stb1 partition by tbname")
         # tdSql.checkRows(40)
         # tdSql.query("select tbname , csum(st1) from stb1 partition by tbname")
@@ -452,7 +452,7 @@ class TDTestCase:
         # tdSql.query("select tbname , csum(st1) from stb1 partition by tbname slimit 1")
         # tdSql.checkRows(7)
 
-        # partition by tags 
+        # partition by tags
         # tdSql.query("select st1 , csum(c1) from stb1 partition by st1")
         # tdSql.checkRows(40)
         # tdSql.query("select csum(c1) from stb1 partition by st1")
@@ -491,4 +491,4 @@ class TDTestCase:
         tdLog.success("%s successfully executed" % __file__)
 
 tdCases.addWindows(__file__, TDTestCase())
-tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
+tdCases.addLinux(__file__, TDTestCase())