6.0.0

(Full Changelog)

IPykernel 6.0 is the first major release in about two years, that brings a number of improvements, code cleanup, and new
features to IPython.

You should be able to view all closed issues and merged Pull Request for this
milestone on
GitHub,
as for any major releases, we advise greater care when updating that for minor
release and welcome any feedback (~50 Pull-requests).

IPykernel 6 should contain all changes of the 5.x series, in addition to the
following non-exhaustive changes.

• Support for the debugger protocol, when using JupyterLab, RetroLab or any
  frontend supporting the debugger protocol you should have access to the
  debugger functionalities.

• The control channel on IPykernel 6.0 is run in a separate thread, this may
  change the order in which messages are processed, though this change was necessary
  to accommodate the debugger.

• We now have a new dependency: matplotlib-inline, this helps to separate the
  circular dependency between IPython/IPykernel and matplotlib.

• All outputs to stdout/stderr should now be captured, including subprocesses
  and output of compiled libraries (blas, lapack....). In notebook
  server, some outputs that would previously go to the notebooks logs will now
  both head to notebook logs and in notebooks outputs. In terminal frontend
  like Jupyter Console, Emacs or other, this may ends up as duplicated outputs.

• coroutines are now native (async-def) , instead of using tornado's
  @gen.coroutine

• OutStreams can now be configured to report istty() == True, while this
  should make some output nicer (for example colored), it is likely to break
  others. Use with care.

New features added

• Implementation of the debugger #597 (@JohanMabille)

Enhancements made

• Make the isatty method of OutStream return true #683 (@peendebak)
• Allow setting cell name #652 (@davidbrochart)
• Try to capture all file descriptor output and err #630 (@Carreau)
• Implemented inspectVariables request #624 (@JohanMabille)
• Specify ipykernel in kernelspec #616 (@SylvainCorlay)
• Use matplotlib-inline #591 (@martinRenou)
• Run control channel in separate thread #585 (@SylvainCorlay)

Bugs fixed

• Remove references to deprecated ipyparallel #695 (@minrk)
• Return len of item written to OutStream #685 (@Carreau)
• Call metadata methods on abort replies #684 (@minrk)
• Fix keyboard interrupt issue in dispatch_shell #673 (@marcoamonteiro)
• Update Trio mode for compatibility with Trio >= 0.18.0 #627 (@mehaase)
• Follow up DeprecationWarning Fix #617 (@afshin)
• Flush control stream upon shutdown #611 (@SylvainCorlay)
• Fix Handling of shell.should_run_async #605 (@afshin)
• Deacrease lag time for eventloop #573 (@impact27)
• Fix "Socket operation on nonsocket" in downstream nbclient test. #641 (@SylvainCorlay)
• Stop control thread before closing sockets on it #659 (@minrk)
• Fix debugging with native coroutines #651 (@SylvainCorlay)
• Fixup master build #649 (@SylvainCorlay)
• Fix parent header retrieval #639 (@davidbrochart)
• Add missing self #636 (@Carreau)
• Backwards compat with older versions of zmq #665 (@mlucool)

Maintenance and upkeep improvements

• Remove pin on Jedi because that was already fixed in IPython #692 (@ccordoba12)
• Remove deprecated source parameter since 4.0.1 (2015) #690 (@Carreau)
• Remove deprecated SocketABC since 4.5.0 #689 (@Carreau)
• Remove deprecated profile options of connect.py #688 (@Carreau)
• Remove ipykernel.codeutil deprecated since IPykernel 4.3.1 (Feb 2016) #687 (@Carreau)
• Keep preferring SelectorEventLoop on Windows #669 (@minrk)
• Add Kernel.get_parent to match set_parent #661 (@minrk)
• Flush control queue prior to handling shell messages #658 (@minrk)
• Add Kernel.get_parent_header #657 (@minrk)
• Build docs only on Ubuntu: add jobs to check docstring formatting. #644 (@Carreau)
• Make deprecated shell_streams writable #638 (@minrk)
• Use channel get_msg helper method #634 (@davidbrochart)
• Use native coroutines instead of tornado coroutines #632 (@SylvainCorlay)
• Make less use of ipython_genutils #631 (@SylvainCorlay)
• Run GitHub Actions on all branches #625 (@afshin)
• Move Python-specific bits to ipkernel #610 (@SylvainCorlay)
• Update Python Requirement to 3.7 #608 (@afshin)
• Replace import item from ipython_genutils to traitlets. #601 (@Carreau)
• Some removal of ipython_genutils.py3compat. #600 (@Carreau)
• Fixup get_parent_header call #662 (@SylvainCorlay)
• Update of ZMQInteractiveshell. #643 (@Carreau)
• Removed filtering of stack frames for testing #633 (@JohanMabille)
• Added 'type' field to variables returned by inspectVariables request #628 (@JohanMabille)
• Changed default timeout to 0.0 seconds for stop_on_error_timeout #618 (@MSeal)
• Attempt longer timeout #615 (@SylvainCorlay)
• Clean up release process and add tests #596 (@afshin)
• Kernelspec: ensure path is writable before writing kernel.json. #593 (@jellelicht)
• Add configure_inline_support and call it in the shell #590 (@martinRenou)

Documentation improvements

• Misc Updates to changelog for 6.0 #686 (@Carreau)
• Add 5.5.x Changelog entries #672 (@blink1073)
• Build docs only on ubuntu: add jobs to check docstring formatting. #644 (@Carreau)
• DOC: Autoreformat all docstrings. #642 (@Carreau)
• Bump Python to 3.8 in readthedocs.yml #612 (@minrk)
• Fix typo #663 (@SylvainCorlay)
• Add release note to 5.5.0 about stop_on_error_timeout #613 (@glentakahashi)
• Move changelog to standard location #604 (@afshin)
• Add changelog for 5.5 #594 (@blink1073)
• Change to markdown for changelog #595 (@afshin)

Deprecations in 6.0

• Kernels now support only a single shell stream, multiple streams will now be ignored. The attribute
  Kernel.shell_streams (plural) is deprecated in ipykernel 6.0. Use Kernel.shell_stream (singular)
• Kernel._parent_header is deprecated, even though it was private. Use .get_parent() now.

Removal in 6.0

• ipykernel.codeutils was deprecated since 4.x series (2016) and has been removed, please import similar
  functionalities from ipyparallel
• remove find_connection_file and profile argument of connect_qtconsole and get_connection_info, deprecated since IPykernel 4.2.2 (2016).

Contributors to this release

(GitHub contributors page for this release)

@afshin | @blink1073 | @Carreau | @ccordoba12 | @davidbrochart | @dsblank | @glentakahashi | @impact27 | @ivanov | @jellelicht | @jkablan | @JohanMabille | @kevin-bates | @marcoamonteiro | @martinRenou | @mehaase | @minrk | @mlucool | @MSeal | @peendebak | @SylvainCorlay | @tacaswell