[Twisted-Python] Waiting time for tests running on Travis CI and Buildbot

[Amber "Hawkie" Brown]

The only reason to support Python 3.3 is PyPy3. However, since they now have funding to push it to 3.5, and PyPy3 is by no means production ready, I think it is reasonable to do this.

I will announce the release after Twisted 16.4 as the final one to support Python 3.3, in accordance with our compatibility policy.

- Amber

> On 24 Aug 2016, at 01:27, Mark Williams <markrwilliams at gmail.com> wrote:
> 
> On Tue, Aug 23, 2016 at 09:44:16AM -0700, Glyph Lefkowitz wrote:
>> 
>> We can drop support for 3.3 of course, but that's a separate discussion.
> 
> I'm marginally in favor of it.  I appreciate Adi's concern about the
> build infrastructure.  And thanks to the inimitable Donald Stufft,
> it's easy to get a sense of how popular Python 3.3 is among Twisted
> users and whether or not dropping support for it will affect a large
> percentage of them.
> 
> He provided the following BigTable Query to run against the PyPI
> downloads dataset (available at
> https://bigquery.cloud.google.com/dataset/the-psf:pypi?pli=1 ):
> 
> SELECT
>  REGEXP_EXTRACT(details.python, r"^([^\.]+\.[^\.]+)") as python_version,
>  COUNT(*) as downloads,
> FROM
>  TABLE_DATE_RANGE(
>    [the-psf:pypi.downloads],
>    DATE_ADD(CURRENT_TIMESTAMP(), -31, "day"),
>    DATE_ADD(CURRENT_TIMESTAMP(), -1, "day")
>  )
> WHERE file.project = 'twisted'
> GROUP BY python_version
> ORDER BY
>  downloads DESC
> 
> 
> Here're the results:
> 
> python_version	downloads
> 2.7             446869
> null            21959
> 3.5             15204
> 3.4             11245
> 2.6             5060
> 3.3             1060
> 3.2             271
> 3.6             241
> 2.4             5
> 1.17		    3
> 2.5	            2
> 
> (Donald explained that `null` represents mirrors and caches like
> bandersnatch.)
> 
> It appears that dropping Python 3.3 wouldn't exclude very many of our
> users.
> 
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