100 lines
3.7 KiB
ReStructuredText
100 lines
3.7 KiB
ReStructuredText
Python 2.7 and 3.4 support
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==========================
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It is demanding on the maintainers of an open source project to support many Python versions, as
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there's extra cost of keeping code compatible between all versions, while holding back on
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features only made possible on newer Python versions.
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In case of Python 2 and 3, the difference between the languages makes it even more prominent,
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because many new Python 3 features cannot be used in a Python 2/3 compatible code base.
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Python 2.7 EOL has been reached :pep:`in 2020 <0373#maintenance-releases>`, with
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the last release made in April, 2020.
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Python 3.4 EOL has been reached :pep:`in 2019 <0429#release-schedule>`, with the last release made in March, 2019.
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For those reasons, in Jun 2019 it was decided that **pytest 4.6** series will be the last to support Python 2.7 and 3.4.
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What this means for general users
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---------------------------------
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Thanks to the `python_requires`_ setuptools option,
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Python 2.7 and Python 3.4 users using a modern pip version
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will install the last pytest 4.6.X version automatically even if 5.0 or later versions
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are available on PyPI.
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Users should ensure they are using the latest pip and setuptools versions for this to work.
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Maintenance of 4.6.X versions
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-----------------------------
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Until January 2020, the pytest core team ported many bug-fixes from the main release into the
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``4.6.x`` branch, with several 4.6.X releases being made along the year.
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From now on, the core team will **no longer actively backport patches**, but the ``4.6.x``
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branch will continue to exist so the community itself can contribute patches.
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The core team will be happy to accept those patches, and make new 4.6.X releases **until mid-2020**
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(but consider that date as a ballpark, after that date the team might still decide to make new releases
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for critical bugs).
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.. _`python_requires`: https://packaging.python.org/guides/distributing-packages-using-setuptools/#python-requires
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Technical aspects
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~~~~~~~~~~~~~~~~~
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(This section is a transcript from :issue:`5275`).
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In this section we describe the technical aspects of the Python 2.7 and 3.4 support plan.
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.. _what goes into 4.6.x releases:
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What goes into 4.6.X releases
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+++++++++++++++++++++++++++++
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New 4.6.X releases will contain bug fixes only.
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When will 4.6.X releases happen
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+++++++++++++++++++++++++++++++
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New 4.6.X releases will happen after we have a few bugs in place to release, or if a few weeks have
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passed (say a single bug has been fixed a month after the latest 4.6.X release).
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No hard rules here, just ballpark.
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Who will handle applying bug fixes
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++++++++++++++++++++++++++++++++++
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We core maintainers expect that people still using Python 2.7/3.4 and being affected by
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bugs to step up and provide patches and/or port bug fixes from the active branches.
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We will be happy to guide users interested in doing so, so please don't hesitate to ask.
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**Backporting changes into 4.6**
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Please follow these instructions:
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#. ``git fetch --all --prune``
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#. ``git checkout origin/4.6.x -b backport-XXXX`` # use the PR number here
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#. Locate the merge commit on the PR, in the *merged* message, for example:
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nicoddemus merged commit 0f8b462 into pytest-dev:features
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#. ``git cherry-pick -m1 REVISION`` # use the revision you found above (``0f8b462``).
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#. Open a PR targeting ``4.6.x``:
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* Prefix the message with ``[4.6]`` so it is an obvious backport
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* Delete the PR body, it usually contains a duplicate commit message.
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**Providing new PRs to 4.6**
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Fresh pull requests to ``4.6.x`` will be accepted provided that
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the equivalent code in the active branches does not contain that bug (for example, a bug is specific
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to Python 2 only).
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Bug fixes that also happen in the mainstream version should be first fixed
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there, and then backported as per instructions above.
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