Merge branch 'main' into pre-commit-ci-update-config

Author: ianthomas23

CHANGELOG.md

@@ -2,6 +2,35 @@
 
 <!-- <START NEW CHANGELOG ENTRY> -->
 
+## 7.2.0a1
+
+([Full Changelog](https://github.com/ipython/ipykernel/compare/v7.2.0a0...220a3c6e8b24ffb3f8678925712ff3644aafb41e))
+
+### New features added
+
+- Added kernel_protocol_version to kernelspec [#1483](https://github.com/ipython/ipykernel/pull/1483) ([@JohanMabille](https://github.com/JohanMabille), [@ianthomas23](https://github.com/ianthomas23))
+
+### Enhancements made
+
+- Made IOPubThread constructor backward compatible [#1492](https://github.com/ipython/ipykernel/pull/1492) ([@JohanMabille](https://github.com/JohanMabille), [@SylvainCorlay](https://github.com/SylvainCorlay), [@ianthomas23](https://github.com/ianthomas23))
+- Advertizes kernel protocol 5.5 [#1488](https://github.com/ipython/ipykernel/pull/1488) ([@JohanMabille](https://github.com/JohanMabille), [@ianthomas23](https://github.com/ianthomas23))
+- Upgrade to jupyter_client 8.8.0 [#1487](https://github.com/ipython/ipykernel/pull/1487) ([@JohanMabille](https://github.com/JohanMabille), [@ianthomas23](https://github.com/ianthomas23))
+
+### Maintenance and upkeep improvements
+
+- Update pytest requirement from \<9,>=7.0 to >=7.0,\<10 in the actions group across 1 directory [#1489](https://github.com/ipython/ipykernel/pull/1489) ([@JohanMabille](https://github.com/JohanMabille))
+
+### Contributors to this release
+
+The following people contributed discussions, new ideas, code and documentation contributions, and review.
+See [our definition of contributors](https://github-activity.readthedocs.io/en/latest/use/#how-does-this-tool-define-contributions-in-the-reports).
+
+([GitHub contributors page for this release](https://github.com/ipython/ipykernel/graphs/contributors?from=2026-01-08&to=2026-01-30&type=c))
+
+@ianthomas23 ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aianthomas23+updated%3A2026-01-08..2026-01-30&type=Issues)) | @JohanMabille ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3AJohanMabille+updated%3A2026-01-08..2026-01-30&type=Issues)) | @SylvainCorlay ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3ASylvainCorlay+updated%3A2026-01-08..2026-01-30&type=Issues))
+
+<!-- <END NEW CHANGELOG ENTRY> -->
+
 ## 7.2.0a0
 
 ([Full Changelog](https://github.com/ipython/ipykernel/compare/v7.1.0...6786ddd040c1f0e8aaeae7e261eec511e2a37fd9))
@@ -36,8 +65,6 @@ See [our definition of contributors](https://github-activity.readthedocs.io/en/l
 
 @arjxn-py ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aarjxn-py+updated%3A2025-10-27..2026-01-08&type=Issues)) | @Carreau ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3ACarreau+updated%3A2025-10-27..2026-01-08&type=Issues)) | @ianthomas23 ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aianthomas23+updated%3A2025-10-27..2026-01-08&type=Issues)) | @JohanMabille ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3AJohanMabille+updated%3A2025-10-27..2026-01-08&type=Issues)) | @newville ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Anewville+updated%3A2025-10-27..2026-01-08&type=Issues)) | @SylvainCorlay ([activity](https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3ASylvainCorlay+updated%3A2025-10-27..2026-01-08&type=Issues))
 
-<!-- <END NEW CHANGELOG ENTRY> -->
-
 ## 7.1.0
 
 IPykernel 7.1.0 fixes an issue where display outputs such as Matplotlib plots were not included when using `%notebook` magic to save sessions as `.ipynb` files (#1435). This is enabled using the traitlet `ZMQDisplayPublisher.store_display_history` which defaults to the previous behaviour of False. This is a minor release rather than a patch release due to the addition of the new traitlet.

ipykernel/_version.py

@@ -5,7 +5,7 @@
 import re
 
 # Version string must appear intact for hatch versioning
-__version__ = "7.2.0a0"
+__version__ = "7.2.0a1"
 
 # Build up version_info tuple for backwards compatibility
 pattern = r"(?P<major>\d+).(?P<minor>\d+).(?P<patch>\d+)(?P<rest>.*)"

ipykernel/inprocess/ipkernel.py

@@ -56,7 +56,7 @@ class InProcessKernel(IPythonKernel):
 
     @default("iopub_thread")
     def _default_iopub_thread(self):
-        thread = IOPubThread(self._underlying_iopub_socket, self.session)
+        thread = IOPubThread(self._underlying_iopub_socket, session=self.session)
         thread.start()
         return thread
 

ipykernel/iostream.py

@@ -47,7 +47,7 @@ class IOPubThread:
     whose IO is always run in a thread.
     """
 
-    def __init__(self, socket, session=None, pipe=False):
+    def __init__(self, socket, pipe=False, session=False):
         """Create IOPub thread
 
         Parameters
@@ -518,7 +518,7 @@ def __init__(
                 DeprecationWarning,
                 stacklevel=2,
             )
-            pub_thread = IOPubThread(pub_thread, self.session)
+            pub_thread = IOPubThread(pub_thread, session=self.session)
             pub_thread.start()
         self.pub_thread = pub_thread
         self.name = name

ipykernel/kernelapp.py

@@ -382,7 +382,7 @@ def init_iopub(self, context):
         self.iopub_port = self._bind_socket(self.iopub_socket, self.iopub_port)
         self.log.debug("iopub PUB Channel on port: %i", self.iopub_port)
         self.configure_tornado_logger()
-        self.iopub_thread = IOPubThread(self.iopub_socket, self.session, pipe=True)
+        self.iopub_thread = IOPubThread(self.iopub_socket, pipe=True, session=self.session)
         self.iopub_thread.start()
         # backward-compat: wrap iopub socket API in background thread
         self.iopub_socket = self.iopub_thread.background_socket

pyproject.toml

@@ -55,7 +55,7 @@ docs = [
   "trio"
 ]
 test = [
-    "pytest>=7.0,<9",
+    "pytest>=7.0,<10",
     "pytest-cov",
     # 'pytest-xvfb; platform_system == "Linux"',
     "flaky",

tests/test_io.py

@@ -28,7 +28,7 @@ def ctx():
 def iopub_thread(ctx):
     session = Session()
     with ctx.socket(zmq.PUB) as pub:
-        thread = IOPubThread(pub, session)
+        thread = IOPubThread(pub, session=session)
         thread.start()
 
         yield thread
@@ -156,7 +156,7 @@ def subprocess_test_echo_watch():
     # use PUSH socket to avoid subscription issues
     with zmq.Context() as ctx, ctx.socket(zmq.PUSH) as pub:
         pub.connect(os.environ["IOPUB_URL"])
-        iopub_thread = IOPubThread(pub, session)
+        iopub_thread = IOPubThread(pub, session=session)
         iopub_thread.start()
         stdout_fd = sys.stdout.fileno()
         sys.stdout.flush()