IPython 8.12

Hopefully slightly early release for IPython 8.12. Last Thursday of the month, even if I guess it's likely already Friday somewhere in the pacific ocean.

A number of PRs and bug fixes this month with close to 20 PRs merged !

The IPython repo reached :ghpull:`14000` !! Actually the PR that create those exact release note is :ghpull:`14000`. Ok, more issues and PR is not always better, and I'd love to have more time to close issues and Pull Requests.

Let's note that in less than 2 month JupyterCon is back, in Paris please visit jupytercon.com, and looking forward to see you there.

Packagers should take note that typing_extension is now a mandatory dependency for Python versions <3.10.

Let's note also that according to NEP29, It is soon time to stop support for Python 3.8 that will be release more than 3 and 1/2 years ago:

On Apr 14, 2023 drop support for Python 3.8 (initially released on Oct 14, 2019)

Thus I am likely to stop advertising support for Python 3.8 in the next release at the end of April.

Here are some miscellaneous updates of interest:

• :ghpull:`13957` brings updates to the Qt integration, particularly for Qt6.
• :ghpull:`13960` fixes the %debug magic command to give access to the local scope.
• :ghpull:`13964` fixes some crashes with the new fast traceback code. Note that there are still some issues with the fast traceback code, and I a, likely to fix and tweak behavior.
• :ghpull:`13973` We are slowly migrating IPython internals to use proper type objects/dataclasses instead of dictionaries to allow static typing checks. These are technically public API and could lead to breakage, so please let us know if that's the case and I'll mitigate.
• :ghpull:`13990`, :ghpull:`13991`, :ghpull:`13994` all improve keybinding and shortcut configurability.

As usual you can find the full list of PRs on GitHub under the 8.12 milestone.

We want to thank the D.E. Shaw group for requesting and sponsoring the work on the following big feature. We had productive discussions on how to best expose this feature

In [1]: class User:
   ...:
   ...:     __custom_documentations__ = {
   ...:         "first": "The first name of the user.",
   ...:         "last": "The last name of the user.",
   ...:     }
   ...:
   ...:     first:str
   ...:     last:str
   ...:
   ...:     def __init__(self, first, last):
   ...:         self.first = first
   ...:         self.last = last
   ...:
   ...:     @property
   ...:     def full(self):
   ...:         """`self.first` and `self.last` joined by a space."""
   ...:         return self.first + " " + self.last
   ...:
   ...:
   ...: user = Person('Jane', 'Doe')

In [2]: user.first?
Type:            str
String form:     Jane
Length:          4
Docstring:       the first name of a the person object, a str
Class docstring:
....

In [3]: user.last?
Type:            str
String form:     Doe
Length:          3
Docstring:       the last name, also a str
...

In [4]: user.full?
HERE
Type:        property
String form: <property object at 0x102bb15d0>
Docstring:   first and last join by a space

IPython 8.11

Back on almost regular monthly schedule for IPython with end-of-month really-late-Friday release to make sure some bugs are properly fixed. Small addition of with a few new features, bugfix and UX improvements.

This is a non-exhaustive list, but among other you will find:

my_shortcuts = [
    {
        "command": "IPython:auto_suggest.accept_character",
        "new_keys": ["right"]
    }
]
%config TerminalInteractiveShell.shortcuts = my_shortcuts

IPython 8.10

Out of schedule release of IPython with minor fixes to patch a potential CVE-2023-24816. This is a really low severity CVE that you most likely are not affected by unless:

• You are on windows.
• You have a custom build of Python without _ctypes
• You cd or start IPython or Jupyter in untrusted directory which names may be valid shell commands.

You can read more on the advisory.

In addition to fixing this CVE we also fix a couple of outstanding bugs and issues.

As usual you can find the full list of PRs on GitHub under the 8.10 milestone.

In Particular:

• bump minimum numpy to >=1.21 version following NEP29. :ghpull:`13930`
• fix for compatibility with MyPy 1.0. :ghpull:`13933`
• fix nbgrader stalling when IPython's showtraceback function is monkeypatched. :ghpull:`13934`

As this release also contains those minimal changes in addition to fixing the CVE I decided to bump the minor version anyway.

This will not affect the normal release schedule, so IPython 8.11 is due in about 2 weeks.

IPython 8.9.0

Second release of IPython in 2023, last Friday of the month, we are back on track. This is a small release with a few bug-fixes, and improvements, mostly with respect to terminal shortcuts.

The biggest improvement for 8.9 is a drastic amelioration of the auto-suggestions sponsored by D.E. Shaw and implemented by the more and more active contributor @krassowski <https://github.com/krassowski>.

• right accepts a single character from suggestion
• ctrl+right accepts a semantic token (macos default shortcuts take precedence and need to be disabled to make this work)
• backspace deletes a character and resumes hinting autosuggestions
• ctrl-left accepts suggestion and moves cursor left one character.
• backspace deletes a character and resumes hinting autosuggestions
• down moves to suggestion to later in history when no lines are present below the cursors.
• up moves to suggestion from earlier in history when no lines are present above the cursor.

This is best described by the Gif posted by @krassowski <https://github.com/krassowski>, and in the PR itself :ghpull:`13888`.

Please report any feedback in order for us to improve the user experience. In particular we are also working on making the shortcuts configurable.

If you are interested in better terminal shortcuts, I also invite you to participate in issue 13879.

As we follow NEP29, next version of IPython will officially stop supporting numpy 1.20, and will stop supporting Python 3.8 after April release.

As usual you can find the full list of PRs on GitHub under the 8.9 milestone.

Thanks to the D. E. Shaw group for sponsoring work on IPython and related libraries.

IPython 8.8.0

First release of IPython in 2023 as there was no release at the end of December.

This is an unusually big release (relatively speaking) with more than 15 Pull Requests merged.

Of particular interest are:

• :ghpull:`13852` that replaces the greedy completer and improves completion, in particular for dictionary keys.
• :ghpull:`13858` that adds py.typed to setup.cfg to make sure it is bundled in wheels.
• :ghpull:`13869` that implements tab completions for IPython options in the shell when using argcomplete <https://github.com/kislyuk/argcomplete>. I believe this also needs a recent version of Traitlets.
• :ghpull:`13865` makes the inspector class of InteractiveShell configurable.
• :ghpull:`13880` that removes minor-version entrypoints as the minor version entry points that would be included in the wheel would be the one of the Python version that was used to build the whl file.

In no particular order, the rest of the changes update the test suite to be compatible with Pygments 2.14, various docfixes, testing on more recent python versions and various updates.

As usual you can find the full list of PRs on GitHub under the 8.8 milestone.

Many thanks to @krassowski for the many PRs and @jasongrout for reviewing and merging contributions.

Thanks to the D. E. Shaw group for sponsoring work on IPython and related libraries.

IPython 8.7.0

Small release of IPython with a couple of bug fixes and new features for this month. Next month is the end of year, it is unclear if there will be a release close to the new year's eve, or if the next release will be at the end of January.

Here are a few of the relevant fixes, as usual you can find the full list of PRs on GitHub under the 8.7 milestone.

• :ghpull:`13834` bump the minimum prompt toolkit to 3.0.11.
• IPython shipped with the py.typed marker now, and we are progressively adding more types. :ghpull:`13831`
• :ghpull:`13817` add configuration of code blacks formatting.

Thanks to the D. E. Shaw group for sponsoring work on IPython and related libraries.

IPython 8.6.0

Back to a more regular release schedule (at least I try), as Friday is already over by more than 24h hours. This is a slightly bigger release with a few new features that contain no less than 25 PRs.

We'll notably found a couple of non negligible changes:

The install_ext and related functions have been removed after being deprecated for years. You can use pip to install extensions. pip did not exist when install_ext was introduced. You can still load local extensions without installing them. Just set your sys.path for example. :ghpull:`13744`

IPython now has extra entry points that use the major and minor version of python. For some of you this means that you can do a quick ipython3.10 to launch IPython from the Python 3.10 interpreter, while still using Python 3.11 as your main Python. :ghpull:`13743`

The completer matcher API has been improved. See :ghpull:`13745`. This should improve the type inference and improve dict keys completions in many use case. Thanks @krassowski for all the work, and the D.E. Shaw group for sponsoring it.

The color of error nodes in tracebacks can now be customized. See :ghpull:`13756`. This is a private attribute until someone finds the time to properly add a configuration option. Note that with Python 3.11 that also shows the relevant nodes in traceback, it would be good to leverage this information (plus the "did you mean" info added on attribute errors). But that's likely work I won't have time to do before long, so contributions welcome.

As we follow NEP 29, we removed support for numpy 1.19 :ghpull:`13760`.

The open() function present in the user namespace by default will now refuse to open the file descriptors 0,1,2 (stdin, out, err), to avoid crashing IPython. This mostly occurs in teaching context when incorrect values get passed around.

The ?, ??, and corresponding pinfo, pinfo2 magics can now find objects inside arrays. That is to say, the following now works:

>>> def my_func(*arg, **kwargs):pass
>>> container = [my_func]
>>> container[0]?

If container define a custom getitem, this __will__ trigger the custom method. So don't put side effects in your getitems. Thanks to the D.E. Shaw group for the request and sponsoring the work.

As usual you can find the full list of PRs on GitHub under the 8.6 milestone.

Thanks to all hacktoberfest contributors, please contribute to closember.org.

Thanks to the D. E. Shaw group for sponsoring work on IPython and related libraries.

IPython 8.5.0

First release since a couple of month due to various reasons and timing preventing me for sticking to the usual monthly release the last Friday of each month. This is of non negligible size as it has more than two dozen PRs with various fixes an bug fixes.

Many thanks to everybody who contributed PRs for your patience in review and merges.

Here is a non-exhaustive list of changes that have been implemented for IPython 8.5.0. As usual you can find the full list of issues and PRs tagged with the 8.5 milestone.

• Added a shortcut for accepting auto suggestion. The End key shortcut for accepting auto-suggestion This binding works in Vi mode too, provided TerminalInteractiveShell.emacs_bindings_in_vi_insert_mode is set to be True :ghpull:`13566`.
• No popup in window for latex generation when generating latex (e.g. via _latex_repr_) no popup window is shows under Windows. :ghpull:`13679`
• Fixed error raised when attempting to tab-complete an input string with consecutive periods or forward slashes (such as "file:///var/log/..."). :ghpull:`13675`
• Relative filenames in Latex rendering : The latex_to_png_dvipng command internally generates input and output file arguments to latex and dvipis. These arguments are now generated as relative files to the current working directory instead of absolute file paths. This solves a problem where the current working directory contains characters that are not handled properly by latex and dvips. There are no changes to the user API. :ghpull:`13680`
• Stripping decorators bug: Fixed bug which meant that ipython code blocks in restructured text documents executed with the ipython-sphinx extension skipped any lines of code containing python decorators. :ghpull:`13612`
• Allow some modules with frozen dataclasses to be reloaded. :ghpull:`13732`
• Fix paste magic on wayland. :ghpull:`13671`
• show maxlen in deque's repr. :ghpull:`13648`

---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
Input In [3], in <cell line: 1>()
----> 1 myfunc(2)

Input In [2], in myfunc(z)
      1 def myfunc(z):
----> 2     foo.boo(z-1)

File ~/code/python/ipython/foo.py:3, in boo(x)
      2 def boo(x):
----> 3     return 1/(1-x)

ZeroDivisionError: division by zero

---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
Cell In [3], line 1
----> 1 myfunc(2)

Cell In [2], line 2, in myfunc(z)
      1 def myfunc(z):
----> 2     foo.boo(z-1)

File ~/code/python/ipython/foo.py:3, in boo(x)
      2 def boo(x):
----> 3     return 1/(1-x)

ZeroDivisionError: division by zero

Traceback (most recent call last):
  Cell In [12], line 1
    myfunc(2)
  Cell In [6], line 2 in myfunc
    foo.boo(z-1)
  File ~/code/python/ipython/foo.py:3 in boo
    return 1/(1-x)
ZeroDivisionError: division by zero

IPython 8.4.0

As for 7.34, this version contains a single fix: fix uncaught BdbQuit exceptions on ipdb exit :ghpull:`13668`, and a single typo fix in documentation: :ghpull:`13682`

Thanks to the D. E. Shaw group for sponsoring work on IPython and related libraries.

IPython 8.3.0

• :ghpull:`13625`, using ?, ??, *? will not call set_next_input as most frontend allow proper multiline editing and it was causing issues for many users of multi-cell frontends. This has been backported to 7.33
• :ghpull:`13600`, pre_run_*-hooks will now have a cell_id attribute on the info object when frontend provides it. This has been backported to 7.33
• :ghpull:`13624`, fixed :kbd:`End` key being broken after accepting an auto-suggestion.
• :ghpull:`13657` fixed an issue where history from different sessions would be mixed.

IPython 8.2.0

IPython 8.2 mostly bring bugfixes to IPython.

• Auto-suggestion can now be elected with the end key. :ghpull:`13566`
• Some traceback issues with assert etb is not None have been fixed. :ghpull:`13588`
• History is now pulled from the sqitel database and not from in-memory. In particular when using the %paste magic, the content of the pasted text will be part of the history and not the verbatim text %paste anymore. :ghpull:`13592`
• Fix Ctrl-\\ exit cleanup :ghpull:`13603`
• Fixes to ultratb ipdb support when used outside of IPython. :ghpull:`13498`

I am still trying to fix and investigate :ghissue:`13598`, which seems to be random, and would appreciate help if you find a reproducible minimal case. I've tried to make various changes to the codebase to mitigate it, but a proper fix will be difficult without understanding the cause.

All the issues on pull-requests for this release can be found in the 8.2 milestone. . And some documentation only PR can be found as part of the 7.33 milestone (currently not released).

Thanks to the D. E. Shaw group for sponsoring work on IPython and related libraries.

IPython 8.1.1

Fix an issue with virtualenv and Python 3.8 introduced in 8.1

Revert :ghpull:`13537` (fix an issue with symlinks in virtualenv) that raises an error in Python 3.8, and fixed in a different way in :ghpull:`13559`.

IPython 8.1.0

IPython 8.1 is the first minor release after 8.0 and fixes a number of bugs and updates a few behaviors that were problematic with the 8.0 as with many new major release.

Note that beyond the changes listed here, IPython 8.1.0 also contains all the features listed in :ref:`version 7.32`.

• Misc and multiple fixes around quotation auto-closing. It is now disabled by default. Run with TerminalInteractiveShell.auto_match=True to re-enabled
• Require pygments>=2.4.0 :ghpull:`13459`, this was implicit in the code, but is now explicit in setup.cfg/setup.py
• Docs improvement of core.magic_arguments examples. :ghpull:`13433`
• Multi-line edit executes too early with await. :ghpull:`13424`
• black is back as an optional dependency, and autoformatting disabled by default until some fixes are implemented (black improperly reformat magics). :ghpull:`13471` Additionally the ability to use yapf as a code reformatter has been added :ghpull:`13528` . You can use TerminalInteractiveShell.autoformatter="black", TerminalInteractiveShell.autoformatter="yapf" to re-enable auto formating with black, or switch to yapf.
• Fix and issue where display was not defined.
• Auto suggestions are now configurable. Currently only AutoSuggestFromHistory (default) and None. new provider contribution welcomed. :ghpull:`13475`
• multiple packaging/testing improvement to simplify downstream packaging (xfail with reasons, try to not access network...).
• Update deprecation. InteractiveShell.magic internal method has been deprecated for many years but did not emit a warning until now.
• internal appended_to_syspath context manager has been deprecated.
• fix an issue with symlinks in virtualenv :ghpull:`13537` (Reverted in 8.1.1)
• Fix an issue with vim mode, where cursor would not be reset on exit :ghpull:`13472`
• ipython directive now remove only known pseudo-decorators :ghpull:`13532`
• IPython/lib/security which used to be used for jupyter notebook has been removed.
• Fix an issue where async with would execute on new lines. :ghpull:`13436`

We want to remind users that IPython is part of the Jupyter organisations, and thus governed by a Code of Conduct. Some of the behavior we have seen on GitHub is not acceptable. Abuse and non-respectful comments on discussion will not be tolerated.

Many thanks to all the contributors to this release, many of the above fixed issues and new features were done by first time contributors, showing there is still plenty of easy contribution possible in IPython . You can find all individual contributions to this milestone on github.

Thanks as well to the D. E. Shaw group for sponsoring work on IPython and related libraries. In particular the Lazy autoloading of magics that you will find described in the 7.32 release notes.

IPython 8.0.1 (CVE-2022-21699)

IPython 8.0.1, 7.31.1 and 5.11 are security releases that change some default values in order to prevent potential Execution with Unnecessary Privileges.

Almost all version of IPython looks for configuration and profiles in current working directory. Since IPython was developed before pip and environments existed it was used a convenient way to load code/packages in a project dependant way.

In 2022, it is not necessary anymore, and can lead to confusing behavior where for example cloning a repository and starting IPython or loading a notebook from any Jupyter-Compatible interface that has ipython set as a kernel can lead to code execution.

I did not find any standard way for packaged to advertise CVEs they fix, I'm thus trying to add a __patched_cves__ attribute to the IPython module that list the CVEs that should have been fixed. This attribute is informational only as if a executable has a flaw, this value can always be changed by an attacker.

In [1]: import IPython

In [2]: IPython.__patched_cves__
Out[2]: {'CVE-2022-21699'}

In [3]: 'CVE-2022-21699' in IPython.__patched_cves__
Out[3]: True

Thus starting with this version:

• The current working directory is not searched anymore for profiles or configurations files.
• Added a __patched_cves__ attribute (set of strings) to IPython module that contain the list of fixed CVE. This is informational only.

Further details can be read on the GitHub Advisory

IPython 8.0

IPython 8.0 is bringing a large number of new features and improvements to both the user of the terminal and of the kernel via Jupyter. The removal of compatibility with an older version of Python is also the opportunity to do a couple of performance improvements in particular with respect to startup time. The 8.x branch started diverging from its predecessor around IPython 7.12 (January 2020).

This release contains 250+ pull requests, in addition to many of the features and backports that have made it to the 7.x branch. Please see the 8.0 milestone for the full list of pull requests.

Please feel free to send pull requests to update those notes after release, I have likely forgotten a few things reviewing 250+ PRs.

Dependencies changes/downstream packaging

Most of our building steps have been changed to be (mostly) declarative and follow PEP 517. We are trying to completely remove setup.py (:ghpull:`13238`) and are looking for help to do so.

• minimum supported traitlets version is now 5+
• we now require stack_data
• minimal Python is now 3.8
• nose is not a testing requirement anymore
• pytest replaces nose.
• iptest/iptest3 cli entrypoints do not exist anymore.
• the minimum officially ​supported numpy version has been bumped, but this should not have much effect on packaging.

Deprecation and removal

We removed almost all features, arguments, functions, and modules that were marked as deprecated between IPython 1.0 and 5.0. As a reminder, 5.0 was released in 2016, and 1.0 in 2013. Last release of the 5 branch was 5.10.0, in May 2020. The few remaining deprecated features we left have better deprecation warnings or have been turned into explicit errors for better error messages.

I will use this occasion to add the following requests to anyone emitting a deprecation warning:

• Please add at least stacklevel=2 so that the warning is emitted into the caller context, and not the callee one.
• Please add since which version something is deprecated.

As a side note, it is much easier to conditionally compare version numbers rather than using try/except when functionality changes with a version.

I won't list all the removed features here, but modules like IPython.kernel, which was just a shim module around ipykernel for the past 8 years, have been removed, and so many other similar things that pre-date the name Jupyter itself.

We no longer need to add IPython.extensions to the PYTHONPATH because that is being handled by load_extension.

We are also removing Cythonmagic, sympyprinting and rmagic as they are now in other packages and no longer need to be inside IPython.

Documentation

The majority of our docstrings have now been reformatted and automatically fixed by the experimental Vélin project to conform to numpydoc.

Type annotations

While IPython itself is highly dynamic and can't be completely typed, many of the functions now have type annotations, and part of the codebase is now checked by mypy.

Featured changes

Here is a features list of changes in IPython 8.0. This is of course non-exhaustive. Please note as well that many features have been added in the 7.x branch as well (and hence why you want to read the 7.x what's new notes), in particular features contributed by QuantStack (with respect to debugger protocol and Xeus Python), as well as many debugger features that I was pleased to implement as part of my work at QuanSight and sponsored by DE Shaw.

In [1]: def foo():
...:     return 3 / 0
...:

In [2]: foo()
---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
<ipython-input-2-c19b6d9633cf> in <module>
----> 1 foo()

<ipython-input-1-1595a74c32d5> in foo()
    1 def foo():
----> 2     return 3 / 0
    3

ZeroDivisionError: division by zero

In [1]: def foo():
...:     return 3 / 0
...:

Input In [2]: foo()
---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
input In [2], in <module>
----> 1 foo()

Input In [1], in foo()
    1 def foo():
----> 2     return 3 / 0

ZeroDivisionError: division by zero

def foo(i):
    x = [[[0]]]
    return x[0][i][0]


def bar():
    return foo(0) + foo(
        1
    ) + foo(2)

IndexError
Input In [2], in <module>
----> 1 bar()
        ^^^^^

Input In [1], in bar()
      6 def bar():
----> 7     return foo(0) + foo(
                            ^^^^
      8         1
         ^^^^^^^^
      9     ) + foo(2)
         ^^^^

Input In [1], in foo(i)
      1 def foo(i):
      2     x = [[[0]]]
----> 3     return x[0][i][0]
                   ^^^^^^^

ZeroDivisionError               Traceback (most recent call last)
File ~/error.py:4, in <module>
      1 def f():
      2     1/0
----> 4 f()

File ~/error.py:2, in f()
      1 def f():
----> 2     1/0

Autosuggestions

Autosuggestion is a very useful feature available in fish, zsh, and prompt-toolkit.

Ptpython allows users to enable this feature in ptpython/config.py.

This feature allows users to accept autosuggestions with ctrl e, ctrl f, or right arrow as described below.

1. Start ipython

2. Run print("hello")

3. start typing print again to see the autosuggestion

4. Press ctrl-f, or ctrl-e, or right-arrow to accept the suggestion

You can also complete word by word:

1. Run def say_hello(): print("hello")

2. Start typing the first letter if def to see the autosuggestion

3. Press alt-f (or escape followed by f), to accept the first word of the suggestion

Importantly, this feature does not interfere with tab completion:

1. After running def say_hello(): print("hello"), press d

2. Press Tab to start tab completion

3A. Press Tab again to select the first option

3B. Press alt f (escape, f) to accept to accept the first word of the suggestion

3C. Press ctrl-f or ctrl-e to accept the entire suggestion

Currently, autosuggestions are only shown in the emacs or vi insert editing modes:

• The ctrl e, ctrl f, and alt f shortcuts work by default in emacs mode.
• To use these shortcuts in vi insert mode, you will have to create custom keybindings in your config.py.

ipdb> partial?
Init signature: partial(self, /, *args, **kwargs)
Docstring:
partial(func, *args, **keywords) - new function with partial application
of the given arguments and keywords.
File:           ~/.pyenv/versions/3.8.6/lib/python3.8/functools.py
Type:           type
Subclasses:

~8/1-~6/5   # see history from the first line of 8 sessions ago,
            # to the fifth line of 6 sessions ago.``

-g <pattern>  # glob ALL history for the specified pattern.

In [1]: 2 * 2 == 4
Out[1]: True

In [2]: print("This still works as pasted")

In [1]: [ins] In [13]: 2 * 2 == 4
   ...: Out[13]: True
   ...:
  File "<ipython-input-1-727bb88eaf33>", line 1
    [ins] In [13]: 2 * 2 == 4
          ^
SyntaxError: invalid syntax

Preparing for Python 3.10

To prepare for Python 3.10, we have started working on removing reliance and any dependency that is not compatible with Python 3.10. This includes migrating our test suite to pytest and starting to remove nose. This also means that the iptest command is now gone and all testing is via pytest.

This was in large part thanks to the NumFOCUS Small Developer grant, which enabled us to allocate $4000 to hire Nikita Kniazev (@Kojoley), who did a fantastic job at updating our code base, migrating to pytest, pushing our coverage, and fixing a large number of bugs. I highly recommend contacting them if you need help with C++ and Python projects.

You can find all relevant issues and PRs with the SDG 2021 tag

Removing support for older Python versions

We are removing support for Python up through 3.7, allowing internal code to use the more efficient pathlib and to make better use of type annotations.

We had about 34 PRs only to update some logic to update some functions from managing strings to using Pathlib.

The completer has also seen significant updates and now makes use of newer Jedi APIs, offering faster and more reliable tab completion.

Misc Statistics

Here are some numbers:

7.x: 296 files, 12561 blank lines, 20282 comments, 35142 line of code.
8.0: 252 files, 12053 blank lines, 19232 comments, 34505 line of code.

$ git diff --stat 7.x...master  | tail -1
340 files changed, 13399 insertions(+), 12421 deletions(-)

We have commits from 162 authors, who contributed 1916 commits in 23 month, excluding merges (to not bias toward maintainers pushing buttons).:

$ git shortlog  -s --no-merges  7.x...master | sort -nr
535  Matthias Bussonnier
 86  Nikita Kniazev
 69  Blazej Michalik
 49  Samuel Gaist
 27  Itamar Turner-Trauring
 18  Spas Kalaydzhisyki
 17  Thomas Kluyver
 17  Quentin Peter
 17  James Morris
 17  Artur Svistunov
 15  Bart Skowron
 14  Alex Hall
 13  rushabh-v
 13  Terry Davis
 13  Benjamin Ragan-Kelley
  8  martinRenou
  8  farisachugthai
  7  dswij
  7  Gal B
  7  Corentin Cadiou
  6  yuji96
  6  Martin Skarzynski
  6  Justin Palmer
  6  Daniel Goldfarb
  6  Ben Greiner
  5  Sammy Al Hashemi
  5  Paul Ivanov
  5  Inception95
  5  Eyenpi
  5  Douglas Blank
  5  Coco Mishra
  5  Bibo Hao
  5  André A. Gomes
  5  Ahmed Fasih
  4  takuya fujiwara
  4  palewire
  4  Thomas A Caswell
  4  Talley Lambert
  4  Scott Sanderson
  4  Ram Rachum
  4  Nick Muoh
  4  Nathan Goldbaum
  4  Mithil Poojary
  4  Michael T
  4  Jakub Klus
  4  Ian Castleden
  4  Eli Rykoff
  4  Ashwin Vishnu
  3  谭九鼎
  3  sleeping
  3  Sylvain Corlay
  3  Peter Corke
  3  Paul Bissex
  3  Matthew Feickert
  3  Fernando Perez
  3  Eric Wieser
  3  Daniel Mietchen
  3  Aditya Sathe
  3  007vedant
  2  rchiodo
  2  nicolaslazo
  2  luttik
  2  gorogoroumaru
  2  foobarbyte
  2  bar-hen
  2  Theo Ouzhinski
  2  Strawkage
  2  Samreen Zarroug
  2  Pete Blois
  2  Meysam Azad
  2  Matthieu Ancellin
  2  Mark Schmitz
  2  Maor Kleinberger
  2  MRCWirtz
  2  Lumir Balhar
  2  Julien Rabinow
  2  Juan Luis Cano Rodríguez
  2  Joyce Er
  2  Jakub
  2  Faris A Chugthai
  2  Ethan Madden
  2  Dimitri Papadopoulos
  2  Diego Fernandez
  2  Daniel Shimon
  2  Coco Bennett
  2  Carlos Cordoba
  2  Boyuan Liu
  2  BaoGiang HoangVu
  2  Augusto
  2  Arthur Svistunov
  2  Arthur Moreira
  2  Ali Nabipour
  2  Adam Hackbarth
  1  richard
  1  linar-jether
  1  lbennett
  1  juacrumar
  1  gpotter2
  1  digitalvirtuoso
  1  dalthviz
  1  Yonatan Goldschmidt
  1  Tomasz Kłoczko
  1  Tobias Bengfort
  1  Timur Kushukov
  1  Thomas
  1  Snir Broshi
  1  Shao Yang Hong
  1  Sanjana-03
  1  Romulo Filho
  1  Rodolfo Carvalho
  1  Richard Shadrach
  1  Reilly Tucker Siemens
  1  Rakessh Roshan
  1  Piers Titus van der Torren
  1  PhanatosZou
  1  Pavel Safronov
  1  Paulo S. Costa
  1  Paul McCarthy
  1  NotWearingPants
  1  Naelson Douglas
  1  Michael Tiemann
  1  Matt Wozniski
  1  Markus Wageringel
  1  Marcus Wirtz
  1  Marcio Mazza
  1  Lumír 'Frenzy' Balhar
  1  Lightyagami1
  1  Leon Anavi
  1  LeafyLi
  1  L0uisJ0shua
  1  Kyle Cutler
  1  Krzysztof Cybulski
  1  Kevin Kirsche
  1  KIU Shueng Chuan
  1  Jonathan Slenders
  1  Jay Qi
  1  Jake VanderPlas
  1  Iwan Briquemont
  1  Hussaina Begum Nandyala
  1  Gordon Ball
  1  Gabriel Simonetto
  1  Frank Tobia
  1  Erik
  1  Elliott Sales de Andrade
  1  Daniel Hahler
  1  Dan Green-Leipciger
  1  Dan Green
  1  Damian Yurzola
  1  Coon, Ethan T
  1  Carol Willing
  1  Brian Lee
  1  Brendan Gerrity
  1  Blake Griffin
  1  Bastian Ebeling
  1  Bartosz Telenczuk
  1  Ankitsingh6299
  1  Andrew Port
  1  Andrew J. Hesford
  1  Albert Zhang
  1  Adam Johnson

This does not, of course, represent non-code contributions, for which we are also grateful.

API Changes using Frappuccino

This is an experimental exhaustive API difference using Frappuccino

The following items are new in IPython 8.0

+ IPython.core.async_helpers.get_asyncio_loop()
+ IPython.core.completer.Dict
+ IPython.core.completer.Pattern
+ IPython.core.completer.Sequence
+ IPython.core.completer.__skip_doctest__
+ IPython.core.debugger.Pdb.precmd(self, line)
+ IPython.core.debugger.__skip_doctest__
+ IPython.core.display.__getattr__(name)
+ IPython.core.display.warn
+ IPython.core.display_functions
+ IPython.core.display_functions.DisplayHandle
+ IPython.core.display_functions.DisplayHandle.display(self, obj, **kwargs)
+ IPython.core.display_functions.DisplayHandle.update(self, obj, **kwargs)
+ IPython.core.display_functions.__all__
+ IPython.core.display_functions.__builtins__
+ IPython.core.display_functions.__cached__
+ IPython.core.display_functions.__doc__
+ IPython.core.display_functions.__file__
+ IPython.core.display_functions.__loader__
+ IPython.core.display_functions.__name__
+ IPython.core.display_functions.__package__
+ IPython.core.display_functions.__spec__
+ IPython.core.display_functions.b2a_hex
+ IPython.core.display_functions.clear_output(wait=False)
+ IPython.core.display_functions.display(*objs, include='None', exclude='None', metadata='None', transient='None', display_id='None', raw=False, clear=False, **kwargs)
+ IPython.core.display_functions.publish_display_data(data, metadata='None', source='<deprecated>', *, transient='None', **kwargs)
+ IPython.core.display_functions.update_display(obj, *, display_id, **kwargs)
+ IPython.core.extensions.BUILTINS_EXTS
+ IPython.core.inputtransformer2.has_sunken_brackets(tokens)
+ IPython.core.interactiveshell.Callable
+ IPython.core.interactiveshell.__annotations__
+ IPython.core.ultratb.List
+ IPython.core.ultratb.Tuple
+ IPython.lib.pretty.CallExpression
+ IPython.lib.pretty.CallExpression.factory(name)
+ IPython.lib.pretty.RawStringLiteral
+ IPython.lib.pretty.RawText
+ IPython.terminal.debugger.TerminalPdb.do_interact(self, arg)
+ IPython.terminal.embed.Set

The following items have been removed (or moved to superclass):

- IPython.core.application.BaseIPythonApplication.initialize_subcommand
- IPython.core.completer.Sentinel
- IPython.core.completer.skip_doctest
- IPython.core.debugger.Tracer
- IPython.core.display.DisplayHandle
- IPython.core.display.DisplayHandle.display
- IPython.core.display.DisplayHandle.update
- IPython.core.display.b2a_hex
- IPython.core.display.clear_output
- IPython.core.display.display
- IPython.core.display.publish_display_data
- IPython.core.display.update_display
- IPython.core.excolors.Deprec
- IPython.core.excolors.ExceptionColors
- IPython.core.history.warn
- IPython.core.hooks.late_startup_hook
- IPython.core.hooks.pre_run_code_hook
- IPython.core.hooks.shutdown_hook
- IPython.core.interactiveshell.InteractiveShell.init_deprecation_warnings
- IPython.core.interactiveshell.InteractiveShell.init_readline
- IPython.core.interactiveshell.InteractiveShell.write
- IPython.core.interactiveshell.InteractiveShell.write_err
- IPython.core.interactiveshell.get_default_colors
- IPython.core.interactiveshell.removed_co_newlocals
- IPython.core.magics.execution.ExecutionMagics.profile_missing_notice
- IPython.core.magics.script.PIPE
- IPython.core.prefilter.PrefilterManager.init_transformers
- IPython.core.release.classifiers
- IPython.core.release.description
- IPython.core.release.keywords
- IPython.core.release.long_description
- IPython.core.release.name
- IPython.core.release.platforms
- IPython.core.release.url
- IPython.core.ultratb.VerboseTB.format_records
- IPython.core.ultratb.find_recursion
- IPython.core.ultratb.findsource
- IPython.core.ultratb.fix_frame_records_filenames
- IPython.core.ultratb.inspect_error
- IPython.core.ultratb.is_recursion_error
- IPython.core.ultratb.with_patch_inspect
- IPython.external.__all__
- IPython.external.__builtins__
- IPython.external.__cached__
- IPython.external.__doc__
- IPython.external.__file__
- IPython.external.__loader__
- IPython.external.__name__
- IPython.external.__package__
- IPython.external.__path__
- IPython.external.__spec__
- IPython.kernel.KernelConnectionInfo
- IPython.kernel.__builtins__
- IPython.kernel.__cached__
- IPython.kernel.__warningregistry__
- IPython.kernel.pkg
- IPython.kernel.protocol_version
- IPython.kernel.protocol_version_info
- IPython.kernel.src
- IPython.kernel.version_info
- IPython.kernel.warn
- IPython.lib.backgroundjobs
- IPython.lib.backgroundjobs.BackgroundJobBase
- IPython.lib.backgroundjobs.BackgroundJobBase.run
- IPython.lib.backgroundjobs.BackgroundJobBase.traceback
- IPython.lib.backgroundjobs.BackgroundJobExpr
- IPython.lib.backgroundjobs.BackgroundJobExpr.call
- IPython.lib.backgroundjobs.BackgroundJobFunc
- IPython.lib.backgroundjobs.BackgroundJobFunc.call
- IPython.lib.backgroundjobs.BackgroundJobManager
- IPython.lib.backgroundjobs.BackgroundJobManager.flush
- IPython.lib.backgroundjobs.BackgroundJobManager.new
- IPython.lib.backgroundjobs.BackgroundJobManager.remove
- IPython.lib.backgroundjobs.BackgroundJobManager.result
- IPython.lib.backgroundjobs.BackgroundJobManager.status
- IPython.lib.backgroundjobs.BackgroundJobManager.traceback
- IPython.lib.backgroundjobs.__builtins__
- IPython.lib.backgroundjobs.__cached__
- IPython.lib.backgroundjobs.__doc__
- IPython.lib.backgroundjobs.__file__
- IPython.lib.backgroundjobs.__loader__
- IPython.lib.backgroundjobs.__name__
- IPython.lib.backgroundjobs.__package__
- IPython.lib.backgroundjobs.__spec__
- IPython.lib.kernel.__builtins__
- IPython.lib.kernel.__cached__
- IPython.lib.kernel.__doc__
- IPython.lib.kernel.__file__
- IPython.lib.kernel.__loader__
- IPython.lib.kernel.__name__
- IPython.lib.kernel.__package__
- IPython.lib.kernel.__spec__
- IPython.lib.kernel.__warningregistry__
- IPython.paths.fs_encoding
- IPython.terminal.debugger.DEFAULT_BUFFER
- IPython.terminal.debugger.cursor_in_leading_ws
- IPython.terminal.debugger.emacs_insert_mode
- IPython.terminal.debugger.has_selection
- IPython.terminal.debugger.vi_insert_mode
- IPython.terminal.interactiveshell.DISPLAY_BANNER_DEPRECATED
- IPython.terminal.ipapp.TerminalIPythonApp.parse_command_line
- IPython.testing.test
- IPython.utils.contexts.NoOpContext
- IPython.utils.io.IOStream
- IPython.utils.io.IOStream.close
- IPython.utils.io.IOStream.write
- IPython.utils.io.IOStream.writelines
- IPython.utils.io.__warningregistry__
- IPython.utils.io.atomic_writing
- IPython.utils.io.stderr
- IPython.utils.io.stdin
- IPython.utils.io.stdout
- IPython.utils.io.unicode_std_stream
- IPython.utils.path.get_ipython_cache_dir
- IPython.utils.path.get_ipython_dir
- IPython.utils.path.get_ipython_module_path
- IPython.utils.path.get_ipython_package_dir
- IPython.utils.path.locate_profile
- IPython.utils.path.unquote_filename
- IPython.utils.py3compat.PY2
- IPython.utils.py3compat.PY3
- IPython.utils.py3compat.buffer_to_bytes
- IPython.utils.py3compat.builtin_mod_name
- IPython.utils.py3compat.cast_bytes
- IPython.utils.py3compat.getcwd
- IPython.utils.py3compat.isidentifier
- IPython.utils.py3compat.u_format

The following signatures differ between 7.x and 8.0:

- IPython.core.completer.IPCompleter.unicode_name_matches(self, text)
+ IPython.core.completer.IPCompleter.unicode_name_matches(text)

- IPython.core.completer.match_dict_keys(keys, prefix, delims)
+ IPython.core.completer.match_dict_keys(keys, prefix, delims, extra_prefix='None')

- IPython.core.interactiveshell.InteractiveShell.object_inspect_mime(self, oname, detail_level=0)
+ IPython.core.interactiveshell.InteractiveShell.object_inspect_mime(self, oname, detail_level=0, omit_sections='()')

- IPython.core.interactiveshell.InteractiveShell.set_hook(self, name, hook, priority=50, str_key='None', re_key='None', _warn_deprecated=True)
+ IPython.core.interactiveshell.InteractiveShell.set_hook(self, name, hook, priority=50, str_key='None', re_key='None')

- IPython.core.oinspect.Inspector.info(self, obj, oname='', formatter='None', info='None', detail_level=0)
+ IPython.core.oinspect.Inspector.info(self, obj, oname='', info='None', detail_level=0)

- IPython.core.oinspect.Inspector.pinfo(self, obj, oname='', formatter='None', info='None', detail_level=0, enable_html_pager=True)
+ IPython.core.oinspect.Inspector.pinfo(self, obj, oname='', formatter='None', info='None', detail_level=0, enable_html_pager=True, omit_sections='()')

- IPython.core.profiledir.ProfileDir.copy_config_file(self, config_file, path='None', overwrite=False)
+ IPython.core.profiledir.ProfileDir.copy_config_file(self, config_file, path, overwrite=False)

- IPython.core.ultratb.VerboseTB.format_record(self, frame, file, lnum, func, lines, index)
+ IPython.core.ultratb.VerboseTB.format_record(self, frame_info)

- IPython.terminal.embed.InteractiveShellEmbed.mainloop(self, local_ns='None', module='None', stack_depth=0, display_banner='None', global_ns='None', compile_flags='None')
+ IPython.terminal.embed.InteractiveShellEmbed.mainloop(self, local_ns='None', module='None', stack_depth=0, compile_flags='None')

- IPython.terminal.embed.embed(**kwargs)
+ IPython.terminal.embed.embed(*, header='', compile_flags='None', **kwargs)

- IPython.terminal.interactiveshell.TerminalInteractiveShell.interact(self, display_banner='<object object at 0xffffff>')
+ IPython.terminal.interactiveshell.TerminalInteractiveShell.interact(self)

- IPython.terminal.interactiveshell.TerminalInteractiveShell.mainloop(self, display_banner='<object object at 0xffffff>')
+ IPython.terminal.interactiveshell.TerminalInteractiveShell.mainloop(self)

- IPython.utils.path.get_py_filename(name, force_win32='None')
+ IPython.utils.path.get_py_filename(name)

The following are new attributes (that might be inherited):

+ IPython.core.completer.IPCompleter.unicode_names
+ IPython.core.debugger.InterruptiblePdb.precmd
+ IPython.core.debugger.Pdb.precmd
+ IPython.core.ultratb.AutoFormattedTB.has_colors
+ IPython.core.ultratb.ColorTB.has_colors
+ IPython.core.ultratb.FormattedTB.has_colors
+ IPython.core.ultratb.ListTB.has_colors
+ IPython.core.ultratb.SyntaxTB.has_colors
+ IPython.core.ultratb.TBTools.has_colors
+ IPython.core.ultratb.VerboseTB.has_colors
+ IPython.terminal.debugger.TerminalPdb.do_interact
+ IPython.terminal.debugger.TerminalPdb.precmd

The following attribute/methods have been removed:

- IPython.core.application.BaseIPythonApplication.deprecated_subcommands
- IPython.core.ultratb.AutoFormattedTB.format_records
- IPython.core.ultratb.ColorTB.format_records
- IPython.core.ultratb.FormattedTB.format_records
- IPython.terminal.embed.InteractiveShellEmbed.init_deprecation_warnings
- IPython.terminal.embed.InteractiveShellEmbed.init_readline
- IPython.terminal.embed.InteractiveShellEmbed.write
- IPython.terminal.embed.InteractiveShellEmbed.write_err
- IPython.terminal.interactiveshell.TerminalInteractiveShell.init_deprecation_warnings
- IPython.terminal.interactiveshell.TerminalInteractiveShell.init_readline
- IPython.terminal.interactiveshell.TerminalInteractiveShell.write
- IPython.terminal.interactiveshell.TerminalInteractiveShell.write_err
- IPython.terminal.ipapp.LocateIPythonApp.deprecated_subcommands
- IPython.terminal.ipapp.LocateIPythonApp.initialize_subcommand
- IPython.terminal.ipapp.TerminalIPythonApp.deprecated_subcommands
- IPython.terminal.ipapp.TerminalIPythonApp.initialize_subcommand