[Zope-dev] working with different requirements depending on python version

[Tres Seaver]

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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 at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com


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