fixups

jupyter_server/_tz.py

@@ -5,6 +5,8 @@
 """
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
+from __future__ import annotations
+
 from datetime import datetime, timedelta, tzinfo
 from typing import Callable
 

jupyter_server/services/events/handlers.py

@@ -2,9 +2,11 @@
 
 .. versionadded:: 2.0
 """
+from __future__ import annotations
+
 import json
 from datetime import datetime
-from typing import Any, Dict, Optional, cast
+from typing import Any, cast
 
 from jupyter_events import EventLogger
 from tornado import web, websocket
@@ -63,15 +65,15 @@ def on_close(self):
         self.event_logger.remove_listener(listener=self.event_listener)
 
 
-def validate_model(data: Dict[str, Any]) -> None:
+def validate_model(data: dict[str, Any]) -> None:
     """Validates for required fields in the JSON request body"""
     required_keys = {"schema_id", "version", "data"}
     for key in required_keys:
         if key not in data:
             raise web.HTTPError(400, f"Missing `{key}` in the JSON request body.")
 
 
-def get_timestamp(data: Dict[str, Any]) -> Optional[datetime]:
+def get_timestamp(data: dict[str, Any]) -> datetime | None:
     """Parses timestamp from the JSON request body"""
     try:
         if "timestamp" in data:

pyproject.toml

@@ -318,6 +318,7 @@ pydist_resource_paths = ["jupyter_server/static/style/bootstrap.min.css", "jupyt
 post-version-spec = "dev"
 
 [tool.mypy]
+python_version = "3.8"
 check_untyped_defs = true
 disallow_incomplete_defs = true
 no_implicit_optional = true