diff --git a/prog/communication.py b/prog/communication.py
index 6ee46eb2bd0de6ddb473ca1a084481b88413c46c..bfcb63b810d87f2f32e1ac4000a4713776771e8c 100644
--- a/prog/communication.py
+++ b/prog/communication.py
@@ -31,7 +31,7 @@ async def connect_stdin_stdout():
     writer = asyncio.StreamWriter(w_transport, w_protocol, reader, loop)
     return reader, writer
 
-class Socket():
+class Socket:
     async def write():
         raise NotImplementedError
     async def read():
@@ -82,7 +82,7 @@ class UnixSocket(AsincioStreamSocket):
 
 
 
-class MsgParser():
+class MsgParser:
     def __init__(self, socket):
         self.socket = socket
         self.buffer = []
@@ -116,11 +116,11 @@ def msg(head, data):
     assert head
     return int_to_str_len(len(head), 5).encode('utf-8') + int_to_str_len(len(data), 12).encode('utf-8') + head + data
 
-class WaitingQuestion():
+class WaitingQuestion:
     def __init__(self, id):
         self.future = asyncio.get_running_loop().create_future()
 
-class Client():
+class Client:
     def __init__(self, socket):
         self.socket = socket
         self.msg_parser = MsgParser(socket)
@@ -151,7 +151,7 @@ class Client():
         # eprint(asyncio.all_tasks())
         return await q.future
 
-class Server():
+class Server:
     def __init__(self, socket, callback):
         self.socket = socket
         self.msg_parser = MsgParser(socket)
@@ -172,7 +172,7 @@ class Server():
 def cbor_dump(x):
     return cbor2.dumps(x, timezone=local_timezone)
 
-class FuncCaller():
+class FuncCaller:
     def __init__(self, socket=None, is_server=False):
         if socket == None:
             is_server = True
diff --git a/prog/gtfs.py b/prog/gtfs.py
index 595ae3059f2d46aee20316c532121667c8ec9bd0..30c512b35d8b5b3deecc80e469e7dcf65677dd54 100644
--- a/prog/gtfs.py
+++ b/prog/gtfs.py
@@ -47,7 +47,7 @@ class TripStop:
     shape_dist_traveled: float
 
 
-class GtfsDay():
+class GtfsDay:
     def __init__(self, date, data_getter):
         self.date = date
         self.data_getter = data_getter