fix pre-commit errors

jupyter_server/serverapp.py

@@ -26,7 +26,6 @@
 import webbrowser
 from base64 import encodebytes
 
-from jupyter_client import KernelManager
 from jupyter_client.kernelspec import KernelSpecManager
 from jupyter_client.manager import KernelManager
 from jupyter_client.session import Session
@@ -96,10 +95,7 @@
     AsyncFileContentsManager,
     FileContentsManager,
 )
-from jupyter_server.services.contents.largefilemanager import (
-    AsyncLargeFileManager,
-    LargeFileManager,
-)
+from jupyter_server.services.contents.largefilemanager import AsyncLargeFileManager
 from jupyter_server.services.contents.manager import (
     AsyncContentsManager,
     ContentsManager,
@@ -115,7 +111,6 @@
     MappingKernelManager,
 )
 from jupyter_server.services.sessions.sessionmanager import SessionManager
-from jupyter_server.traittypes import TypeFromClasses
 from jupyter_server.utils import (
     check_pid,
     fetch,
@@ -148,10 +143,6 @@
     raise ImportError(_i18n("The Jupyter Server requires tornado >=%s.%s.%s") % MIN_TORNADO) from e
 
 
-if not sys.platform.startswith("win"):
-    from tornado.netutil import bind_unix_socket
-
-
 try:
     import resource
 except ImportError:

jupyter_server/services/kernels/websocket.py

@@ -1,19 +1,10 @@
 """Tornado handlers for WebSocket <-> ZMQ sockets."""
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
-import json
 import re
-import struct
-import sys
 from typing import Optional, no_type_check
 from urllib.parse import urlparse
 
-try:
-    from jupyter_client.jsonutil import json_default
-except ImportError:
-    from jupyter_client.jsonutil import date_default as json_default
-
-from jupyter_client.jsonutil import extract_dates
 from tornado import ioloop, web
 from tornado.iostream import IOStream
 from tornado.websocket import WebSocketHandler

pyproject.toml

@@ -209,4 +209,7 @@ extend-ignore = [
 per-file-ignores = [
     # B011: Do not call assert False since python -O removes these calls
     # F841 local variable 'foo' is assigned to but never used
-    "tests/*: B011, F841"]
+    "tests/*: B011, F841",
+    # Ignore flake 8 errors from shimmed imports
+    "jupyter_server/base/zmqhandlers.py:F401"
+]