diff --git a/osm_common/msglocal.py b/osm_common/msglocal.py
index 843b376..c10ff17 100644
--- a/osm_common/msglocal.py
+++ b/osm_common/msglocal.py
@@ -34,8 +34,7 @@
 
 
 class MsgLocal(MsgBase):
-
-    def __init__(self, logger_name='msg', lock=False):
+    def __init__(self, logger_name="msg", lock=False):
         super().__init__(logger_name, lock)
         self.path = None
         # create a different file for each topic
@@ -86,7 +85,12 @@
             with self.lock:
                 if topic not in self.files_write:
                     self.files_write[topic] = open(self.path + topic, "a+")
-                yaml.safe_dump({key: msg}, self.files_write[topic], default_flow_style=True, width=20000)
+                yaml.safe_dump(
+                    {key: msg},
+                    self.files_write[topic],
+                    default_flow_style=True,
+                    width=20000,
+                )
                 self.files_write[topic].flush()
         except Exception as e:  # TODO refine
             raise MsgException(str(e), HTTPStatus.INTERNAL_SERVER_ERROR)
@@ -102,14 +106,18 @@
             if isinstance(topic, (list, tuple)):
                 topic_list = topic
             else:
-                topic_list = (topic, )
+                topic_list = (topic,)
             while True:
                 for single_topic in topic_list:
                     with self.lock:
                         if single_topic not in self.files_read:
-                            self.files_read[single_topic] = open(self.path + single_topic, "a+")
+                            self.files_read[single_topic] = open(
+                                self.path + single_topic, "a+"
+                            )
                             self.buffer[single_topic] = ""
-                        self.buffer[single_topic] += self.files_read[single_topic].readline()
+                        self.buffer[single_topic] += self.files_read[
+                            single_topic
+                        ].readline()
                         if not self.buffer[single_topic].endswith("\n"):
                             continue
                         msg_dict = yaml.safe_load(self.buffer[single_topic])
@@ -123,7 +131,9 @@
         except Exception as e:  # TODO refine
             raise MsgException(str(e), HTTPStatus.INTERNAL_SERVER_ERROR)
 
-    async def aioread(self, topic, loop=None, callback=None, aiocallback=None, group_id=None, **kwargs):
+    async def aioread(
+        self, topic, loop=None, callback=None, aiocallback=None, group_id=None, **kwargs
+    ):
         """
         Asyncio read from one or several topics. It blocks
         :param topic: can be str: single topic; or str list: several topics