Use Python 3.9 for linting

.github/workflows/main.yml

@@ -100,6 +100,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
+        with:
+          python-version: "3.9"
       - name: Run Linters
         run: |
           hatch run typing:test

.pre-commit-config.yaml

@@ -37,12 +37,12 @@ repos:
         types_or: [yaml, html, json]
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: "v1.8.0"
+    rev: "v1.13.0"
     hooks:
       - id: mypy
         files: jupyter_client
         stages: [manual]
-        args: ["--install-types", "--non-interactive"]
+        args: ["--install-types", "--non-interactive", "--python-version=3.9"]
         additional_dependencies:
           ["traitlets>=5.13", "ipykernel>=6.26", "jupyter_core>=5.3.2"]
 

jupyter_client/client.py

@@ -241,7 +241,7 @@ async def _stdin_hook_default(self, msg: t.Dict[str, t.Any]) -> None:
         prompt = getpass if content.get("password", False) else input
 
         try:
-            raw_data = prompt(content["prompt"])  # type:ignore[operator]
+            raw_data = prompt(content["prompt"])
         except EOFError:
             # turn EOFError into EOF character
             raw_data = "\x04"

jupyter_client/launcher.py

@@ -65,6 +65,8 @@ def launch_kernel(
     # If this process in running on pythonw, we know that stdin, stdout, and
     # stderr are all invalid.
     redirect_out = sys.executable.endswith("pythonw.exe")
+    _stdout: Any
+    _stderr: Any
     if redirect_out:
         blackhole = open(os.devnull, "w")  # noqa
         _stdout = blackhole if stdout is None else stdout