Merge branch 'master' into feature/implicit-bootstrapfeature/implicit-bootstrap

1 files changed, 69 insertions, 0 deletions

diff --git a/docs/python 2 sunset.txt b/docs/python 2 sunset.txt
new file mode 100644
index 00000000..f7b7ee25
--- /dev/null
+++ b/docs/python 2 sunset.txt
@@ -0,0 +1,69 @@
+:orphan:
+
+Python 2 Sunset
+===============
+
+Since January 2020 and the release of Setuptools 45, Python 2 is no longer
+supported by the most current release (`discussion
+<https://github.com/pypa/setuptools/issues/1458>`_). Setuptools as a project
+continues to support Python 2 with bugfixes and important features on
+Setuptools 44.x.
+
+By design, most users will be unaffected by this change. That's because
+Setuptools 45 declares its supported Python versions to exclude Python 2.7,
+and installers such as pip 9 or later will honor this declaration and prevent
+installation of Setuptools 45 or later in Python 2 environments.
+
+Users that do import any portion of Setuptools 45 or later on Python 2 are
+directed to this documentation to provide guidance on how to work around the
+issues.
+
+Workarounds
+-----------
+
+The best recommendation is to avoid Python 2 and move to Python 3 where
+possible. This project acknowledges that not all environments can drop Python
+2 support, so provides other options.
+
+In less common scenarios, later versions of Setuptools can be installed on
+unsupported Python versions. In these environments, the installer is advised
+to first install ``setuptools<45`` to "pin Setuptools" to a compatible
+version.
+
+- When using older versions of pip (before 9.0), the ``Requires-Python``
+  directive is not honored and invalid versions can be installed. Users are
+  advised first to upgrade pip and retry or to pin Setuptools. Use ``pip
+  --version`` to determine the version of pip.
+- When using ``easy_install``, ``Requires-Python`` is not honored and later
+  versions can be installed. In this case, users are advised to pin
+  Setuptools. This applies to ``setup.py install`` invocations as well, as
+  they use Setuptools under the hood.
+
+It's still not working
+----------------------
+
+If after trying the above steps, the Python environment still has incompatible
+versions of Setuptools installed, here are some things to try.
+
+1. Uninstall and reinstall Setuptools. Run ``pip uninstall -y setuptools`` for
+   the relevant environment. Repeat until there is no Setuptools installed.
+   Then ``pip install setuptools``.
+2. If possible, attempt to replicate the problem in a second environment
+   (virtual machine, friend's computer, etc). If the issue is isolated to just
+   one unique enviornment, first determine what is different about those
+   environments (or reinstall/reset the failing one to defaults).
+3. End users who are not themselves the maintainers for the package they are
+   trying to install should contact the support channels for the relevant
+   application. Please be considerate of those projects by searching for
+   existing issues and following the latest guidance before reaching out for
+   support. When filing an issue, be sure to give as much detail as possible
+   to help the maintainers understand what factors led to the issue after
+   following their recommended guidance.
+4. Reach out to your local support groups. There's a good chance someone
+   nearby has the expertise and willingness to help.
+5. If all else fails, `file this template
+   <https://github.com/pypa/setuptools/issues/new?assignees=&labels=Python+2&template=setuptools-warns-about-python-2-incompatibility.md&title=Incompatible+install+in+(summarize+your+environment)>`_
+   with Setuptools. Please complete the whole template, providing as much
+   detail about what factors led to the issue. Setuptools maintainers will
+   summarily close tickets filed without any meaningful detail or engagement
+   with the issue.