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add notice about Python 2/3

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Martin Cech
2019-10-07 12:06:33 -04:00
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doc/source/releases/19.09_announce.rst
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@@ -94,11 +94,36 @@ Going forward the MySQL database server is no longer supported and all deployers
Deprecation Notice
==================
API
---
The following Galaxy API endpoints (related to the Toolshed) are considered deprecated and staged for removal in the next release:
* **api/toolshed/** { category | repository | search | show | status | tool_json }
* **api/toolshed_repositories/** { check_for_updates | exported_workflows | get_latest_installable_revision | import_workflow | import_workflows | install | repair_repository_revision | shed_category | shed_repository | shed_search | status }
Python
------
TL;DR Galaxy can be deployed on both Python 2 and 3 with Python3 expected to be the increasingly encouraged way of deployment.
Python2 will `not be maintained <https://www.python.org/doc/sunset-python-2/>`__ past 2020 which means Galaxy 19.09 is
the last release that officially supports Python 2.
Over the past years Galaxy team has made a substantial effort
spearheaded by `@nsoranzo <https://github.com/nsoranzo>`__ and `@mvdbeek <https://github.com/mvdbeek>`__
to make Galaxy compatible with Python3. Thanks to this endeavor the `Galaxy Test server <https://test.galaxyproject.org>`__
has been running on Python3 since April of this year and **Galaxy itself now fully supports Python3**.
**Galaxy Tools**, that properly declare their Python2 dependency (using <requirements>), will continue to work as expected with Python2
being provided by Conda. However tools that naively rely on implicit presence of Python2 on the PATH can fail on Python3 deployments.
Another corner case are tools that use Python2-specific Cheetah templating syntax in their XML. We have implemented various mitigation
approaches on the Galaxy side but some old tools using this syntax will not function correctly.
*In our testing these problems should affect only a very limited number of tools and the vast majority should
work on Python3 without a change.*
Release Notes
=============