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Changes in IPython kernel



5.1.0 fixes some important regressions in 5.0, especially on Windows.

5.1.0 on GitHub

  • Fix message-ordering bug that could result in out-of-order executions, especially on Windows (:ghpull:`356`)
  • Fix classifiers to indicate dropped Python 2 support (:ghpull:`354`)
  • Remove some dead code (:ghpull:`355`)
  • Support rich-media responses in inspect_requests (tooltips) (:ghpull:`361`)



5.0.0 on GitHub

  • Drop support for Python 2. ipykernel 5.0 requires Python >= 3.4
  • Add support for IPython's asynchronous code execution (:ghpull:`323`)
  • Update release process in (:ghpull:`339`)


4.10 on GitHub



4.9.0 on GitHub



4.8.2 on GitHub

  • Fix compatibility issue with qt eventloop and pyzmq 17 (:ghpull:`307`).


4.8.1 on GitHub

  • set zmq.ROUTER_HANDOVER socket option when available to workaround libzmq reconnect bug (:ghpull:`300`).
  • Fix sdists including absolute paths for kernelspec files, which prevented installation from sdist on Windows (:ghpull:`306`).


4.8.0 on GitHub

  • Cleanly shutdown integrated event loops when shutting down the kernel. (:ghpull:`290`)
  • %gui qt now uses Qt 5 by default rather than Qt 4, following a similar change in terminal IPython. (:ghpull:`293`)
  • Fix event loop integration for :mod:`asyncio` when run with Tornado 5, which uses asyncio where available. (:ghpull:`296`)



4.7.0 on GitHub

  • Add event loop integration for :mod:`asyncio`.
  • Use the new IPython completer API.
  • Add support for displaying GIF images (mimetype image/gif).
  • Allow the kernel to be interrupted without killing the Qt console.
  • Fix is_complete response with cell magics.
  • Clean up encoding of bytes objects.
  • Clean up help links to use https and improve display titles.
  • Clean up ioloop handling in preparation for tornado 5.



4.6.1 on GitHub

  • Fix eventloop-integration bug preventing Qt windows/widgets from displaying with ipykernel 4.6.0 and IPython ≥ 5.2.
  • Avoid deprecation warnings about naive datetimes when working with jupyter_client ≥ 5.0.


4.6.0 on GitHub

  • Add to API DisplayPublisher.publish two new fully backward-compatible keyword-args:

    • update: bool
    • transient: dict
  • Support new transient key in display_data messages spec for publish. For a display data message, transient contains data that shouldn't be persisted to files or documents. Add a display_id to this transient dict by display(obj, display_id=...)

  • Add ipykernel_launcher module which removes the current working directory from sys.path before launching the kernel. This helps to reduce the cases where the kernel won't start because there's a (or similar) module in the current working directory.

  • Add busy/idle messages on IOPub during processing of aborted requests

  • Add active event loop setting to GUI, which enables the correct response to IPython's is_event_loop_running_xxx

  • Include IPython kernelspec in wheels to reduce reliance on "native kernel spec" in jupyter_client

  • Modify OutStream to inherit from TextIOBase instead of object to improve API support and error reporting

  • Fix IPython kernel death messages at start, such as "Kernel Restarting..." and "Kernel appears to have died", when parent-poller handles PID 1

  • Various bugfixes



4.5.2 on GitHub

  • Fix bug when instantiating Comms outside of the IPython kernel (introduced in 4.5.1).


4.5.1 on GitHub

  • Add missing stream parameter to overridden :func:`getpass`
  • Remove locks from iopub thread, which could cause deadlocks during debugging
  • Fix regression where KeyboardInterrupt was treated as an aborted request, rather than an error
  • Allow instantiating Comms outside of the IPython kernel


4.5 on GitHub

  • Use figure.dpi instead of savefig.dpi to set DPI for inline figures
  • Support ipympl matplotlib backend (requires IPython update as well to fully work)
  • Various bugfixes, including fixes for output coming from threads, and :func:`input` when called with non-string prompts, which stdlib allows.



4.4.1 on GitHub

  • Fix circular import of matplotlib on Python 2 caused by the inline backend changes in 4.4.0.


4.4.0 on GitHub

  • Use MPLBACKEND environment variable to tell matplotlib >= 1.5 use use the inline backend by default. This is only done if MPLBACKEND is not already set and no backend has been explicitly loaded, so setting MPLBACKEND=Qt4Agg or calling %matplotlib notebook or matplotlib.use('Agg') will take precedence.
  • Fixes for logging problems caused by 4.3, where logging could go to the terminal instead of the notebook.
  • Add --sys-prefix and --profile arguments to :command:`ipython kernel install`
  • Allow Comm (Widget) messages to be sent from background threads.
  • Select inline matplotlib backend by default if %matplotlib magic or matplotlib.use() are not called explicitly (for matplotlib >= 1.5).
  • Fix some longstanding minor deviations from the message protocol (missing status: ok in a few replies, connect_reply format).
  • Remove calls to NoOpContext from IPython, deprecated in 5.0.



  • Use a nonempty dummy session key for inprocess kernels to avoid security warnings.


  • Fix Windows Python 3.5 incompatibility caused by faulthandler patch in 4.3


4.3.0 on GitHub

  • Publish all IO in a thread, via :class:`IOPubThread`. This solves the problem of requiring :meth:`sys.stdout.flush` to be called in the notebook to produce output promptly during long-running cells.
  • Remove references to outdated IPython guiref in kernel banner.
  • Patch faulthandler to use sys.__stderr__ instead of forwarded sys.stderr, which has no fileno when forwarded.
  • Deprecate some vestiges of the Big Split: - :func:`ipykernel.find_connection_file` is deprecated. Use :func:`jupyter_client.find_connection_file` instead. - Various pieces of code specific to IPython parallel are deprecated in ipykernel and moved to ipyparallel.



4.2.2 on GitHub

  • Don't show interactive debugging info when kernel crashes
  • Fix handling of numerical types in json_clean
  • Testing fixes for output capturing


4.2.1 on GitHub

  • Fix default display name back to "Python X" instead of "pythonX"


4.2 on GitHub

  • Support sending a full message in initial opening of comms (metadata, buffers were not previously allowed)
  • When using ipython kernel install --name to install the IPython kernelspec, default display-name to the same value as --name.



4.1.1 on GitHub

  • Fix missing ipykernel.__version__ on Python 2.
  • Fix missing target_name when opening comms from the frontend.


4.1 on GitHub

  • add ipython kernel install entrypoint for installing the IPython kernelspec
  • provisional implementation of comm_info request/reply for msgspec v5.1


4.0 on GitHub

4.0 is the first release of ipykernel as a standalone package.