[Twisted-Python] [RFC] Drop support for Python 3.5 sometime after May 2021?

[Craig Rodrigues]

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/compatibility-policy.html
).

None of these items are critial, but I thought I would ask, to get people's
opinions.

--
Craig
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