Stop support for Python 3.9

.github/workflows/ci.yml

@@ -22,10 +22,10 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.9", "3.13"]
+        python-version: ["3.10", "3.13"]
         include:
           - os: ubuntu-latest
-            python-version: "pypy-3.9"
+            python-version: "pypy-3.10"
           - os: macos-latest
             python-version: "3.10"
           - os: ubuntu-latest

ipykernel/iostream.py

@@ -15,9 +15,10 @@
 import warnings
 from binascii import b2a_hex
 from collections import defaultdict, deque
+from collections.abc import Callable
 from io import StringIO, TextIOBase
 from threading import Event, Thread, local
-from typing import Any, Callable
+from typing import Any
 
 import zmq
 from anyio import create_task_group, run, sleep, to_thread

ipykernel/ipkernel.py

@@ -160,10 +160,7 @@ def __init__(self, **kwargs):
         self._new_threads_parent_header = {}
         self._initialize_thread_hooks()
 
-        if hasattr(gc, "callbacks"):
-            # while `gc.callbacks` exists since Python 3.3, pypy does not
-            # implement it even as of 3.9.
-            gc.callbacks.append(self._clean_thread_parent_frames)
+        gc.callbacks.append(self._clean_thread_parent_frames)
 
     help_links = List(
         [

pyproject.toml

@@ -18,7 +18,7 @@ classifiers = [
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "debugpy>=1.8.1",
     "ipython>=7.23.1",

tests/conftest.py

@@ -1,8 +1,9 @@
 import asyncio
 import logging
 import os
+from collections.abc import Callable
 from math import inf
-from typing import Any, Callable, no_type_check
+from typing import Any, no_type_check
 from unittest.mock import MagicMock
 
 import pytest

tests/test_kernel.py

@@ -635,7 +635,7 @@ def ensure_datetime(arg):
 
         # Check messages are processed in order, one at a time, and of a sensible duration.
         previous_end = None
-        for reply, sleep in zip(replies, sleeps):
+        for reply, sleep in zip(replies, sleeps, strict=False):
             start = ensure_datetime(reply["metadata"]["started"])
             end = ensure_datetime(reply["header"]["date"])
 

tests/test_subshells.py

@@ -156,7 +156,7 @@ def test_run_concurrently_sequence(are_subshells, overlap):
             ]
 
         msgs = []
-        for subshell_id, code in zip(subshell_ids, codes):
+        for subshell_id, code in zip(subshell_ids, codes, strict=False):
             msg = kc.session.msg("execute_request", {"code": code})
             msg["header"]["subshell_id"] = subshell_id
             kc.shell_channel.send(msg)
@@ -191,7 +191,7 @@ def test_run_concurrently_timing(include_main_shell):
         # Identical times for both subshells is a harder test as preparing and sending
         # the execute_reply messages may overlap.
         msgs = []
-        for id, sleep in zip(subshell_ids, times):
+        for id, sleep in zip(subshell_ids, times, strict=False):
             code = f"b.wait(); time.sleep({sleep})"
             msg = kc.session.msg("execute_request", {"code": code})
             msg["header"]["subshell_id"] = id
@@ -231,7 +231,9 @@ def test_execution_count():
         # Prepare messages
         times = (0.2, 0.1, 0.4, 0.15)  # Sleep seconds
         msgs = []
-        for i, (id, sleep) in enumerate(zip((None, subshell_id, None, subshell_id), times)):
+        for i, (id, sleep) in enumerate(
+            zip((None, subshell_id, None, subshell_id), times, strict=False)
+        ):
             code = f"b.wait(); time.sleep({sleep})" if i < 2 else f"time.sleep({sleep})"
             msg = kc.session.msg("execute_request", {"code": code})
             msg["header"]["subshell_id"] = id