Python versions

[hugovk]

Stats

• http://py3readiness.org/
• https://python3wos.appspot.com/
• 2013-01-13 https://astrofrog.github.io/blog/2013/01/13/what-python-installations-are-scientists-using/
• 2014-01-31 https://wiki.python.org/moin/2.x-vs-3.x-survey
• 2015-01-26 https://web.archive.org/web/20150228101023/http://blog.frite-camembert.net:80/python-survey-2014.html
• 2015-01-30 http://www.randalolson.com/2015/01/30/python-usage-survey-2014/
• 2015-04-20 https://caremad.io/posts/2015/04/a-year-of-pypi-downloads/
• 2015-05-09 https://astrofrog.github.io/blog/2015/05/09/2015-survey-results/
• 2016-02-14 https://www.reddit.com/r/Python/comments/45sm94/what_are_the_most_recent_python_3_vs_python_2/czzy5wa/
• 2016-02-17 https://hynek.me/articles/python3-2016/
• 2016-03-08 https://blogs.msdn.microsoft.com/pythonengineering/2016/03/08/python-3-is-winning/
• 2016-05-25 https://www.jetbrains.com/pycharm/python-developers-survey-2016/
• 2016-06-13 Deprecate/Drop Support for Python 3.3? pypa/pip#3796
• 2016-09-03 http://www.randalolson.com/2016/09/03/python-2-7-still-reigns-supreme-in-pip-installs/
• 2016-11-11 https://semaphoreci.com/blog/2016/11/11/python-versions-used-in-commercial-projects-2016-edition.html
• 2016-12-09 https://langui.sh/2016/12/09/data-driven-decisions/
• 2017-07-12 https://www.jetbrains.com/research/devecosystem-2017/python/
• 2017-10-17 https://semaphoreci.com/blog/2017/10/18/python-versions-used-in-commercial-projects-in-2017.html

Reasons for dropping old ones

• https://en.wikipedia.org/wiki/CPython#Version_history

2.6

• Unsupported since 2013-10-29
• https://snarky.ca/stop-using-python-2-6/
• http://www.curiousefficiency.org/posts/2015/04/stop-supporting-python26.html
• http://www.python3statement.org
• pip 10 no longer supports Python 2.6 (Drop support for Python 2.6? pypa/pip#3955)
• Wheel no longer supports Python 2.6 pypa/wheel@c9e5486
• Not much PyPI traffic (June 2016) Deprecate/Drop Support for Python 3.3? pypa/pip#3796

3.2

• Unsupported since 2016-02-27
• pip 8 no longer supports Python 3.2 (link)
• Coverage 4 no longer supports Python 3.2 (link)
• Requests no longer supports Python 3.2
• Wheel no longer supports Python 3.2 pypa/wheel@c069986
• Virtually no PyPI traffic (June 2016) Deprecate/Drop Support for Python 3.3? pypa/pip#3796

3.3

• Unsupported since 2017-09-29
• pip 10 deprecates Python 3.3 support, pip 11 won't support it (Deprecate/Drop Support for Python 3.3? pypa/pip#3796)
• Wheel no longer supports Python 3.3 pypa/wheel@c069986
• Very little PyPI traffic (June 2016) Deprecate/Drop Support for Python 3.3? pypa/pip#3796

[hugovk]

Here's monthly pip installs from PyPI (13 December 2017, via pypinfo --percent --pip --markdown "" pyversion)

python_version	percent	download_count
2.7	77.7%	435,636,261
3.6	8.8%	49,199,570
3.5	8.4%	46,927,461
3.4	3.9%	21,843,444
2.6	1.1%	6,194,026
3.3	0.1%	554,661
3.7	0.1%	428,159
3.2	0.0%	38,570
None	0.0%	21,921
2.8	0.0%	35
3.1	0.0%	26

[hugovk]

Python 2 vs 3 stats from Anaconda package servers

• http://pwang.io/report_2018_10.html

From https://discuss.python.org/t/packaging-and-python-2/662/80?u=hugovk

[hugovk]

https://www.ncsc.gov.uk/blog-post/time-to-shed-python-2

[hugovk]

https://ubuntu.com/blog/psa-for-ros-users-some-things-to-know-as-python-2-approaches-eol