diff --git a/osm_common/msgbase.py b/osm_common/msgbase.py
index 7c27f64..49adcb8 100644
--- a/osm_common/msgbase.py
+++ b/osm_common/msgbase.py
@@ -43,7 +43,7 @@
     Base class for all msgXXXX classes
     """
 
-    def __init__(self, logger_name='msg', lock=False):
+    def __init__(self, logger_name="msg", lock=False):
         """
         Constructor of FsBase
         :param logger_name: logging name
@@ -69,13 +69,25 @@
         pass
 
     def write(self, topic, key, msg):
-        raise MsgException("Method 'write' not implemented", http_code=HTTPStatus.INTERNAL_SERVER_ERROR)
+        raise MsgException(
+            "Method 'write' not implemented", http_code=HTTPStatus.INTERNAL_SERVER_ERROR
+        )
 
     def read(self, topic):
-        raise MsgException("Method 'read' not implemented", http_code=HTTPStatus.INTERNAL_SERVER_ERROR)
+        raise MsgException(
+            "Method 'read' not implemented", http_code=HTTPStatus.INTERNAL_SERVER_ERROR
+        )
 
     async def aiowrite(self, topic, key, msg, loop=None):
-        raise MsgException("Method 'aiowrite' not implemented", http_code=HTTPStatus.INTERNAL_SERVER_ERROR)
+        raise MsgException(
+            "Method 'aiowrite' not implemented",
+            http_code=HTTPStatus.INTERNAL_SERVER_ERROR,
+        )
 
-    async def aioread(self, topic, loop=None, callback=None, aiocallback=None, group_id=None, **kwargs):
-        raise MsgException("Method 'aioread' not implemented", http_code=HTTPStatus.INTERNAL_SERVER_ERROR)
+    async def aioread(
+        self, topic, loop=None, callback=None, aiocallback=None, group_id=None, **kwargs
+    ):
+        raise MsgException(
+            "Method 'aioread' not implemented",
+            http_code=HTTPStatus.INTERNAL_SERVER_ERROR,
+        )