diff --git a/python/paddle/v2/plot/tests/test_ploter.py b/python/paddle/v2/plot/tests/test_ploter.py
index 37edb11b5250592a5473d5e8f1322e3f53c4e8b5..a75f853ed933dfce651faf758f71feca7cd8d328 100644
--- a/python/paddle/v2/plot/tests/test_ploter.py
+++ b/python/paddle/v2/plot/tests/test_ploter.py
@@ -35,5 +35,6 @@ class TestCommon(unittest.TestCase):
         self.assertEqual(plot_test.__plot_data__[title2].step, [])
         self.assertEqual(plot_test.__plot_data__[title2].value, [])
 
+
 if __name__ == '__main__':
     unittest.main()