diff --git a/python/paddle/fluid/trainer_factory.py b/python/paddle/fluid/trainer_factory.py
index c28e961cd775b245b7f64397473a364791a9ef4f..0e071251bb2cd319152e98d95a0632b996913cc6 100644
--- a/python/paddle/fluid/trainer_factory.py
+++ b/python/paddle/fluid/trainer_factory.py
@@ -43,7 +43,7 @@ class TrainerFactory(object):
     def _create_trainer(self, opt_info=None):
         trainer = None
         device_worker = None
-        if opt_info == None:
+        if not opt_info:
             # default is MultiTrainer + Hogwild
             trainer = MultiTrainer()
             device_worker = Hogwild()