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

[Amber Brown]

On Thu, 14 May 2020, at 15:13, Glyph wrote:
> On May 13, 2020, at 10:04 PM, Amber Brown (hawkowl) 
> <hawkowl at atleastfornow.net> wrote:
> > 
> > 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.
> > 
> > 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).
> 
> 
> I'm also inclined to say sooner rather than later; I don't know the 
> numbers but my impression is that 3.x uptake began for real at 3.4 and 
> in earnest at 3.6, so there aren't that many people still on 3.5.

A year ago (https://atleastfornow.net/posts/py2-py3-twisted-downloads/), those numbers said that 3.5 was 6.7% of users for the currently released version of Twisted, and 4.37% of all Twisted downloads that month. I could probably rerun them, but I think it's kind of obvious what the results would be.

> 
> The lack of variable annotations, in particular, seems like a sticking 
> point with 3.5 as we attempt to adopt mypy.
> 
> -g
> 
> 
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