I was considering proposing dropping it soon (I was thinking when we had 3.8 support, that 3.6/3.7/3.8 is a reasonable compatibility matrix). Why I think this is probably fine: - Debian Stable (buster) has 3.7. oldstable (stretch) has 3.5.3, but I don't think we care about oldstable. - Ubuntu 18.04 has Python 3.6. 16.04 has 3.5.1, which is a sucky, buggy version that people shouldn't use anyway. Plus, getting a modern Python on Ubuntu isn't shockingly hard (deadsnakes makes it trivial). - CentOS and RHEL 6 and 7 have Software Collections which makes Python 3.6+ readily available. - Windows has 3.8 available in the Store. - MacOS doesn't ship a Python 3, but homebrew/python.org offer 3.8 easily. - For everyone else, there's always Docker. So, I guess if we have 3.8 support, the next release can announce the dropping of 3.5, and then the release after that can be the final one with support. - Amber On 14/5/20 5:10 am, Craig Rodrigues wrote:
I would like to propose that Twisted drop support for Python 3.5 one year from now in 2021.
Reasons:
1. Python 3.5.9 will be the final release of Python 3.5, in November 2019 ( https://www.python.org/dev/peps/pep-0478/ ) 2. Python 3.6.0 was released in December 2016 ( https://www.python.org/dev/peps/pep-0494/ ) 3. PyPy 7.1.1 introduced Python 3.6 support in April 2019 ( https://morepypy.blogspot.com/2019/04/pypy-711-bug-fix-release.html ). PyPy 7.3.1 is the latest PyPy version ( https://morepypy.blogspot.com/2020/04/pypy-731-released.html ).
4. Python 3.6 introduced support for variable annotations ( https://www.python.org/dev/peps/pep-0526/ ) 5. Python 3.6 introduced new string interpolation (f-string) support ( https://www.python.org/dev/peps/pep-0498/ ) 6. Python 3.6 introduced support for asynchronous generators ( https://www.python.org/dev/peps/pep-0525/ ) and asynchronous comprehensions ( https://www.python.org/dev/peps/pep-0530/ )
Based on item 2., Python 3.6.0 has been around for almost 4 years, which is a reasonable amount of time. Based on item 3., PyPy supports Python 3.6.
It might be nice to take advantage of some of the language features introduces in items 4-6.
I think dropping support one year from now in 2021, would give sufficient notice, and be in line with the Twisted Compatibility Policy ( https://twistedmatrix.com/documents/current/core/development/policy/compatib... ).
None of these items are critial, but I thought I would ask, to get people's opinions.
-- Craig
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