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update docs for default and supported Python versions #1250

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Feb 21, 2023
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4 changes: 2 additions & 2 deletions docs/source/config_files.rst
Original file line number Diff line number Diff line change
Expand Up @@ -43,8 +43,8 @@ specified in your ``environment.yml``.
You can also specify which Python version to install in your built environment
with ``environment.yml``. By default, ``repo2docker`` installs
|default_python| with your ``environment.yml`` unless you include the version of
Python in this file. ``conda`` supports all versions of Python,
though ``repo2docker`` support is best with Python 3.7, 3.6, 3.5 and 2.7.
Python in this file. ``conda`` Should support all versions of Python,
though ``repo2docker`` support is best with Python 3.7-3.11.

.. warning::
If you include a Python version in a ``runtime.txt`` file in addition to your
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19 changes: 16 additions & 3 deletions docs/source/faq.rst
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,10 @@ Repo2docker officially supports the following versions of Python
(specified in your :ref:`environment.yml <environment.yml>` or
:ref:`runtime.txt <runtime.txt>` file):

- 3.11 (added in 2023)
- 3.10 (added in 2022, default in 2023)
- 3.9 (added in 2021)
- 3.8 (added in 0.11)
- 3.7 (added in 0.7, default in 0.8)
- 3.6 (default in 0.7 and earlier)
- 3.5
Expand All @@ -35,9 +39,18 @@ in the base environment is not packaged for your Python,
either because the version of the package is too new and your chosen Python is too old,
or vice versa.

I Python 2.7 is specified, a separate environment for the kernel will be
installed with Python 2. The notebook server will run in the default Python 3.7
environment.
If an old version of Python is specified (3.6 or earlier in 2023), a separate environment for the kernel will be installed with your requested Python version.
The notebook server will run in the default |default_python| environment.
That is, your _notebooks_ will run with Python 3.6, while your notebook _server_ will run with |default_python|.

These two environments can be distinguished with ``$NB_PYTHON_PREFIX/bin/python`` for the server and ``$KERNEL_PYTHON_PREFIX/bin/python`` for the kernel.
Both of these environment variables area always defined, even when they are the same.

Starting in 2023, the default version of Python used when Python version is unspecified will be updated more often.
Python itself releases a new version every year now, and repo2docker will follow, with the default Python version generally trailing the latest stable version of Python itself by 1-2 versions.

If you choose not to specify a Python version, your repository is _guaranteed_ to stop working, eventually.
We **strongly** recommend specifying a Python version (in environment.yml, runtime.txt, Pipfile, etc.)

Julia
~~~~~
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