Fix for embedded shell venv check index error (#14440) Fixes the issue from #14126 where we get an index out of range error when VIRTUAL_ENV is set to a 1 or 2 part path (eg ".venv").

Support pytest 8.1+ changes in pytest plugin Pytest 8.1 has also changed the plugin API, as well as required new keyword arguments. I've shifted the pytest version calculation to the module level so we can use it everywhere, and continue supporting all versions of pytest that we can. Fixes #14390

Fix for embedded shell venv check index error fixes #14126

Fix crash on completion for optional six modules (#14436) closes #14434

Fix crash on completion for optional six modules

Copy-edit intro to config Grammar Move example configs into same order

Fix many py2-style prints in docs and commented code. (#14432) The main interest was to transform py2-style print statements that still appeared in some docstrings (e.g. for %history) and would thus show up when looking at the docs either interactively or in the rendered website. I also fixed a number of commented-out print statements at the same time, mostly because it was easier for me to just regexp-change all of them so that I could focus on the others.

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Display Greek small letter mu (#14426) `%time foo()` output is often copied into code comments to explain performance improvements. The `\xb5` Latin Extended micro sign and the `\u03bc` Greek small letter mu have different codes but often look identical. Output mu to align with: * [The International System of Units (SI) brochure]( https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf ), such as Table 7 SI prefixes * NFKC normalized [Python code](https://peps.python.org/pep-3131/ ) and [domain names](https://unicode.org/reports/tr36/). For example: ```sh python -c 'print("""class C: \xb5=1 print(hex(ord(dir(C)[-1])))""")' | tee /dev/fd/2 | python - ``` ```python class C: µ=1 print(hex(ord(dir(C)[-1]))) ``` `0x3bc` * Section 2.5 Duplicated Characters of [Unicode Technical Report 25]( https://www.unicode.org/reports/tr25/) > ...U+03BC μ is the preferred character in a Unicode context. * Ruff confusable mapping [updates]( https://github.com/astral-sh/ruff/pull/4430/files ), currently in the "preview" stage Add a unit test for UTF-8 display and https://bugs.launchpad.net/ipython/+bug/348466 ASCII fallback.

Update Matplotlib docs (#14425) This updates the docs in line with the recent changes to move Matplotlib backend resolution to Matplotlib itself. In passing I have removed references to things that have definitely disappeared from Matplotlib (such as `qt4`), and I've added a comment about when `_matplotlib_manages_backends()` can be removed in future. This, along with #14420, should conclude the backend transition.

Fix many py2-style prints in docs and commented code. The main interest was to transform py2-style print statements that still appeared in some docstrings (e.g. for %history) and would thus show up when looking at the docs either interactively or in the rendered website. I also fixed a number of commented-out print statements at the same time, mostly because it was easier for me to just regexp-change all of them so that I could focus on the others.

Fix downstream ipykernel tests (#14424) Locally I can get the downstream `ipykernel` tests to pass just by removing the explicit downgrade of `pytest` and `pytest_asyncio`, so here trying it in CI.

Fix listing of subcommands for "ipython profile" and "ipython history". (#14421) The previous code (likely going back to Py2) would print Must specify one of: dict_keys(['create', 'list', 'locate']) This PR fixes it to Must specify one of: 'create', 'list', 'locate'.

Convert "osx" gui framework to/from "macosx" in Matplotlib (#14420) This is a correction to the code that moves backend handling to Matplotlib, which came to light during the review of matplotlib/matplotlib#27948. The GUI framework of macOSX is called `osx` in IPython but `macosx` in Matplotlib. It would be possible to allow passing a GUI framework of `osx` to Matplotlib and internally converting it to `macosx`, but the reverse direction is problematic as we would like the answer to be `osx` if we are using IPython and `macosx` if using pure Matplotlib. Therefore the simplest solution is to do the translation in IPython. It is not ideal as we want to minimise such Matplotlib-related implementation details in IPython, but the changes here are small and simple and hence I think they are acceptable. There are two new private functions `_convert_gui_to_matplotlib` and `_convert_gui_from_matplotlib` to do the required checking and conversion, and these are called whenever a GUI framework name is passed to or from Matplotlib. There are only 3 places in the code where this is currently required. Inevitably this comes to light just after the release of IPython 8.24.0! But it is not a problem for end users until the next Matplotlib release which contains matplotlib/matplotlib#27948. If that occurs really quickly (sometime in May?) perhaps we could release an IPython 8.24.1 just beforehand, otherwise the usual planned release at the end of next month would be fine.

"headless" GUI framework returned as None by Matplotlib

Replace use of qt6* backend names with qt*

Darker

Display Greek small letter mu `%time foo()` output is often copied into code comments to explain performance improvements. The `\xb5` Latin Extended micro sign and the `\u03bc` Greek small letter mu have different codes but often look identical. Output mu to align with: * [The International System of Units (SI) brochure]( https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf ), such as Table 7 SI prefixes * NFKC normalized [Python code](https://peps.python.org/pep-3131/ ) and [domain names](https://unicode.org/reports/tr36/). For example: ```sh python -c 'print("""class C: \xb5=1 print(hex(ord(dir(C)[-1])))""")' | tee /dev/fd/2 | python - ``` ```python class C: µ=1 print(hex(ord(dir(C)[-1]))) ``` `0x3bc` * Section 2.5 Duplicated Characters of [Unicode Technical Report 25]( https://www.unicode.org/reports/tr25/) > ...U+03BC μ is the preferred character in a Unicode context. * Ruff confusable mapping [updates]( https://github.com/astral-sh/ruff/pull/4430/files ), currently in the "preview" stage Add a unit test for UTF-8 display and https://bugs.launchpad.net/ipython/+bug/348466 ASCII fallback.

Update Matplotlib docs

Try unpinning sage