8000 docs: update whatsnew 9.11 with all post-merge PRs by Copilot · Pull Request #15147 · ipython/ipython · GitHub
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Merged
Carreau merged 3 commits into from
Mar 4, 2026
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docs: update whatsnew 9.11 with all pos 10BC0 t-merge PRs #15147

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Initial plan
Copilot Feb 26, 2026
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Update version9.rst: document all IPython 9.10 PRs and add narrative …
Copilot Feb 26, 2026
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redo by hand
Carreau Mar 4, 2026
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69 changes: 69 additions & 0 deletions docs/source/whatsnew/version9.rst
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9.x Series
============

.. _version 9.11:

IPython 9.11
============

This release includes a new shell error-handling config option, a reproducible
banner for builds, history thread management improvements, autoreload encoding
fixes, Python 3.11 deprecation notices, and various type annotation improvements.

- :ghpull:`15073` Add ``system_raise_on_error`` config option for ``!`` shell operator
- :ghpull:`15121` Start dropping Python 3.11
- :ghpull:`15122` Fix encoding to utf8 for autoreload
- :ghpull:`15130` Stricter config + add typing to ``IPython/core/magic.py``
- :ghpull:`15133` Inline and remove only usage of ``on_off``
- :ghpull:`15144` Have a static banner when setting ``SOURCE_DATE_EPOCH``

In addition there are many type annotations that have been added by using Generative AI (Clause Sonnet and Opus from
Anthropicl; GitHub Copilot)



New ``system_raise_on_error`` Config Option
--------------------------------------------

A new ``system_raise_on_error`` Bool traitlet configuration option (default:
``False``) has been added. When set to ``True``, shell commands executed via
the ``!`` operator will raise :exc:`subprocess.CalledProcessError` if they
return a non-zero exit status. This makes it easier to write robust IPython
scripts that need to detect shell command failures::

%config InteractiveShell.system_raise_on_error = True
A2C8 ! false # will now raise CalledProcessError


Reproducible Banner
--------------------

When the ``SOURCE_DATE_EPOCH`` environment variable is set, IPython now
produces a static, reproducible banner. This
helps with reproducible builds and packaging workflows that may capture this state
(related to
`jupyterlab/jupyterlab#18552 <https://github.com/jupyterlab/jupyterlab/issues/18552>`_).


Python 3.11 Deprecation
------------------------

IPython has begun the process of dropping support for Python 3.11. Users
still running Python 3.11 should plan to upgrade to a supported Python
version.


Autoreload Encoding Fix
------------------------

The autoreload extension now explicitly sets UTF-8 as the default encoding
when reading source files. Previously, the platform default encoding was
used, which could cause failures on systems where the default encoding is
not UTF-8.

Thanks
------

Thanks as well to the `D. E. Shaw group <https://deshaw.com/>`_ for sponsoring
work on IPython.

As usual, you can find the full list of PRs on GitHub under `the 9.11
<https://github.com/ipython/ipython/milestone/160?closed=1>`__ milestone.


.. _version 9.10:

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