[Distutils] setuptools and py3k
ronaldoussoren at mac.com
Mon Jun 8 17:27:32 CEST 2009
On 8 Jun, 2009, at 5:53, Tres Seaver wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 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
>>>> from pkg_resources import VersionConflict
> ... ws.find(Requirement.parse("Bar==1.0"))
> ... except VersionConflict:
> ... pass
> ... else:
> ... print 'VersionConflict not raised.'
> with no output expected. Note that this is actually *less* verbose
> easier to understand than the repr bit. Of course, a traditional unit
> test would be even shorter and easier to understand.
I like your workaround. A tradition unittest would be better, but I'd
prefer to keep the patches for py3k support as small as possible.
>> The attached file "setup3.py" is a script that incrementally copies
>> the setuptools source-tree to a temporary directory, runs 2to3 on
>> 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.
> Great work.
This is only a first step, I'm found a number of annoying issues that
might require interface changes to get right (such a number of
functions in pkg_resources that claim to return a string, but actually
return bytes (by opening a file in binary mode and returning the file
contents). Hopefully I'll have a set of patches soonish, that would
make discussion easier.
> - --
> Tres Seaver +1 540-429-0999 tseaver at palladion.com
> Palladion Software "Excellence by Design" http://palladion.com
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.6 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> -----END PGP SIGNATURE-----
> Distutils-SIG maillist - Distutils-SIG at python.org
More information about the Distutils-SIG