Post on defaulting to Python 3

default-python-3.rst

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+.. post:: Feb 12, 2019
+   :author: Anthony
+   :tags: python
+
+Defaulting New Projects to Python 3
+===================================
+
+New projects that are just getting started with Read the Docs will now use
+Python 3 by default. While it is still possible to configure your project to use
+Python 2.7 with :doc:`our configuration file <readthedocs:config-file/v2>`, we
+think it's important to help push the Python ecosystem towards adopting Python 3.
+
+Our default Python version is currently Python 3.7. Projects can also select
+Python versions 3.6 and 3.5 using our default build image. We will eventually
+remove support for building projects with Python versions 3.3 and 3.4, however
+it is still possible to select a build image with support for either version.
+
+To select a specific version of Python, other than our default, you can use our
+configuration file to specify a Python version, using the
+:ref:`readthedocs:config-file/v2:python.version` configuration option.
+
+If your project does require Python version 3.3 or 3.4, you can only select
+these versions if you also specify ``stable`` build image for your project's
+:ref:`readthedocs:config-file/v2:build.image` configuration option. As we
+release new versions of our build image, this ``stable`` image will eventually
+lose support for Python 3.3 and 3.4, so it's suggested that your project upgrade
+to a supported version of Python.