chore: refactor code quality issues (#2044)

sanic/mixins/listeners.py

@@ -19,7 +19,7 @@ class ListenerEvent(str, Enum):
 
 class ListenerMixin:
     def __init__(self, *args, **kwargs) -> None:
-        self._future_listeners: List[FutureListener] = list()
+        self._future_listeners: List[FutureListener] = []
 
     def _apply_listener(self, listener: FutureListener):
         raise NotImplementedError  # noqa

sanic/mixins/middleware.py

@@ -6,7 +6,7 @@ from sanic.models.futures import FutureMiddleware
 
 class MiddlewareMixin:
     def __init__(self, *args, **kwargs) -> None:
-        self._future_middleware: List[FutureMiddleware] = list()
+        self._future_middleware: List[FutureMiddleware] = []
 
     def _apply_middleware(self, middleware: FutureMiddleware):
         raise NotImplementedError  # noqa

sanic/websocket.py

@@ -177,7 +177,7 @@ class WebSocketConnection:
             {
                 "type": "websocket.accept",
                 "subprotocol": ",".join(
-                    [subprotocol for subprotocol in self.subprotocols]
+                    list(self.subprotocols)
                 ),
             }
         )

sanic/worker.py

@@ -5,7 +5,7 @@ import signal
 import sys
 import traceback
 
-from gunicorn.workers import base as base  # type: ignore
+from gunicorn.workers import base  # type: ignore
 
 from sanic.log import logger
 from sanic.server import HttpProtocol, Signal, serve, trigger_events