Maybe you could try writing a pip configuration file in 
$HOME/.config/pip/pip.conf (or /etc/pip.conf). Travis dpl must be using pip to 
download twine, and pip should be able to look there for a `pre` option.
(I just guess, haven’t tried myself)

--


Cosimo

Il 3 mar 2018, 18:30 +0000, Jason R. Coombs <jar...@jaraco.com>, ha scritto:
> I tried but as you can see in this job, the environment variables aren’t 
> honored, so it seems I cannot test a twine release in Travis. At this point, 
> I think I’ll just wait for the official release.
>
> > On 3 Mar, 2018, at 11:17, Jason R. Coombs <jar...@jaraco.com> wrote:
> >
> > This sender failed our fraud detection checks and may not be who they 
> > appear to be. Learn about spoofing
> > Feedback
> > Thanks for working on this!
> >
> > In my particular use-case, I rarely run twine myself, but instead rely on 
> > the Travis-CI DPL routine. Looking at that code, I don’t see any means I 
> > have to test a pre-release version.
> >
> > Given the presumably broad impact this one use-case has, it would be nice 
> > if there were a way to test it against pre-release versions of twine (and 
> > maybe also wheel, pip, and setuptools). Perhaps it would be worthwhile to 
> > propose a hook to that project to enable the versions of those projects to 
> > be specified for selective testing.
> >
> > Oh, I just had an idea - perhaps one could set the PIP_PRE environment 
> > variable and that would affect the install and allow the pre-release to be 
> > tested. I’ll give that a go.
> >
> > > On 3 Mar, 2018, at 11:06, Sumana Harihareswara <s...@changeset.nyc> wrote:
> > >
> > > Wrong URL (did I mention I'm new at this?). View 1.10.0rc1, including a
> > > fairly spiffy new README, at:
> > > https://test.pypi.org/project/twine/1.10.0rc1/ -- and please pass word
> > > along to our downstreams.
> > >
> > > -Sumana
> > >
> > > On 03/02/2018 05:32 PM, Sumana Harihareswara wrote:
> > > > (So it turns out I've taken on a volunteer gig, which is that I'm now
> > > > one of the Twine maintainers. I may be wrong about how to do this -
> > > > please feel free to comment on https://github.com/pypa/twine/pull/314
> > > > which is where I'm pulling together a new release checklist for myself.)
> > > >
> > > > https://test.pypi.org/manage/project/twine/release/1.10.0rc1/
> > > >
> > > > This is a release candidate for Twine 1.10.0 which I'm planning to
> > > > release early next week.
> > > >
> > > > This release improves project registration usage text (in some cases
> > > > removing it where inapplicable), and updates `--repository[-url]` usage
> > > > text, prints progress to `stdout` instead of `stderr`, improves the
> > > > progressbar, and reorganizes and improves user and developer 
> > > > documentation.
> > > >
> > > > Please see the changelog
> > > > https://twine.readthedocs.io/en/latest/changelog.html for detailed notes
> > > > under "Next feature release".
> > > >
> > > > I believe this is how you test it out:
> > > >
> > > >  pip install --upgrade --pre --index-url https://test.pypi.org/simple/
> > > > --extra-index-url https://pypi.org/simple twine
> > > >
> > > > Please check existing open issues at
> > > > https://github.com/pypa/twine/issues and open new ones if you have
> > > > problems. Thanks!
> > >
> > >
> > > --
> > > Sumana Harihareswara
> > > Changeset Consulting
> > > https://changeset.nyc
> >
>

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