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Re: working with different requirements depending on python version

by Tres Seaver :: Rate this Message:

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On 06/30/2012 08:54 AM, Chris Withers wrote:

> Hi All,
>
> While trying to debug another problem, I re-ran some Jenkins jobs for
> two of my packages, which promptly failed under Python 2.5:
>
> http://jenkins.simplistix.co.uk/job/testfixtures-buildout/
> http://jenkins.simplistix.co.uk/job/checker-buildout/
>
> Now, the issue here is that zope.interface 4.0 and above no longer
> supports Python 2.5:
>
> http://jenkins.simplistix.co.uk/job/checker-buildout/PYTHON=2.5,label=linux/15/console
>
>

http://pypi.python.org/pypi/zope.interface/4.0.0

>
> That's fine, but I'd like the above projects to continue 2.5 support
> for the time being.
>
> The simple solution would be to add a versions section to the buildout
> here:
>
> https://github.com/Simplistix/checker/blob/master/buildout.cfg
>
> ...and pin the versions in the tox.ini here:
>
> https://github.com/Simplistix/checker/blob/master/tox.ini
>
> ...however, that doesn't give the correct result. The version
> requirement is "use the latest version of all packages that work with
> the Python version under test" and the changes I've suggested would
> mean that on Python 2.6 and 2.7, the latest version of zope.interface
> wouldn't be used.
>
> What makes this even more "interesting" is that zope.interface isn't a
> direct requirement of either of these projects, it's a dependency of
> a dependency in both cases.
>
> How have other people solved this?

For repoze.sendmail, I did two fixups for Python 2.5:

- - I changed 'install_requires' in setup.py based on sys.version_info

https://github.com/repoze/repoze.sendmail/blob/master/setup.py

- - I pinned the verstion in tox.ini:

https://github.com/repoze/repoze.sendmail/blob/master/tox.ini

Tres.
- --
===================================================================
Tres Seaver +1 540-429-0999 tseaver@...
Palladion Software "Excellence by Design" http://palladion.com

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