diff --git a/README.md b/README.md
index db444e878f31e1e40e1b03e3794c39dcbfa0d0c4..8331770bb12898245d892c29f91c1c5d6184bab5 100644
--- a/README.md
+++ b/README.md
@@ -174,4 +174,3 @@ print(res)
                 目前版本支持以下模型：词法分析LAC；情感分析Senta；目标检测SSD；图像分类ResNet, MobileNet, NASNet等。
 
 * 迁移学习: 提供了基于预训练模型的Finetune API，用户通过少量代码即可完成迁移学习，包括BERT/ERNIE文本分类、序列标注、图像分类迁移等。
-
diff --git a/paddlehub/commands/config.py b/paddlehub/commands/config.py
index b1bfaab11cb15db1c8d1a6841547f69a50e00326..22422d8a864c37f0337de2635e1ec92345781b91 100644
--- a/paddlehub/commands/config.py
+++ b/paddlehub/commands/config.py
@@ -80,8 +80,10 @@ class ConfigCommand(BaseCommand):
 
     @staticmethod
     def set_log_level(level):
-        if level not in ["CRITICAL", "FATAL", "ERROR", "WARN",
-                         "WARNING", "INFO", "DEBUG", "NOTSET"]:
+        if level not in [
+                "CRITICAL", "FATAL", "ERROR", "WARN", "WARNING", "INFO",
+                "DEBUG", "NOTSET"
+        ]:
             print("Allowed values include: "
                   "CRITICAL, FATAL, ERROR, WARN, WARNING, INFO, DEBUG, NOTSET")
             return
diff --git a/paddlehub/common/dir.py b/paddlehub/common/dir.py
index f1990a1457862c2083aec7d3bbc0605e4fe1cc95..fee18d542350b5d2e2c2386283dd296ee96e0abb 100644
--- a/paddlehub/common/dir.py
+++ b/paddlehub/common/dir.py
@@ -14,6 +14,7 @@
 # limitations under the License.
 
 import os
+
 # TODO: Change dir.py's filename, this naming rule is not qualified