[Distutils] setuptools and py3k
tseaver at palladion.com
Mon Jun 8 14:53:45 CEST 2009
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Ronald Oussoren wrote:
> But first a question: some of the tests use docutils and I'm having a
> hard time getting those to run with both python3 and python2. The bit
> that's particularly annoying is this bit of api_tests.txt:
> Note that asking for a conflicting version of a distribution
> already in a
> working set triggers a ``pkg_resources.VersionConflict`` error:
> >>> ws.find(Requirement.parse("Bar==1.0")) # doctest:
> Traceback (most recent call last):
> VersionConflict: (Bar 0.9 (http://example.com/something),
> This passes with 2.6, but fails in 3.1 because it expects
> 'pkg_resources.VersionConflict' rather than just 'VersionConflict'.
> What's the best way to work around this issue?
Don't rely on the repr of an exception. This kind of problem is why I
hate using doctest to test edge cases. If you must, then something like:
>>> from pkg_resources import VersionConflict
... except VersionConflict:
... print 'VersionConflict not raised.'
with no output expected. Note that this is actually *less* verbose and
easier to understand than the repr bit. Of course, a traditional unit
test would be even shorter and easier to understand.
> The attached file "setup3.py" is a script that incrementally copies
> the setuptools source-tree to a temporary directory, runs 2to3 on that
> copy and exec-s the contents of the translated 'setup.py' file. This
> seems to be good enough to be able to install setuptools for python2
> and python3 using the same code-base. That said, this is just the
> first step of a python3 port there need to be changes to the
> setuptools sources to be able to actually use the translated sources.
Tres Seaver +1 540-429-0999 tseaver at palladion.com
Palladion Software "Excellence by Design" http://palladion.com
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