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[Python-porting] Python 2/3 compatible distutils installation?

Barry Warsaw barry at python.org
Wed May 16 23:36:25 CEST 2012 
On May 16, 2012, at 12:24 PM, Chris Jerdonek wrote:

>I also encountered this issue recently.  Can you just avoid importing
>anything from your package from within setup.py?

It's not actually *my* setup.py, but I get what you're saying.  In my own
packages, I do try to avoid those types of imports.

>It looks like you're importing your package mostly just to get the
>__version__ number in your package's __init__.py (though I also see you use
>it in the cmdclass argument to setup(), which might require a different
>work-around).

Yep.  It seems like the testtools.TestCommand is required.

>The consequence for me was that I needed to maintain the version
>string for my project in two places: both setup.py and my package's
>__init__.py (and I added a unit test to check that they were the
>same).  I rationalized this by telling myself that the script
>responsible for installing a project shouldn't need to be able to run
>the project: it should be independent.

In my own packages, I still keep the version string in my __init__.py, but I
don't import it from setup.py to get at it.  Instead, I usually just open the
file and grep its lines for the value.  I also have a helper to make this
easier, e.g.

http://bazaar.launchpad.net/~barry/flufl.enum/trunk/view/head:/setup_helpers.py

and its use in my setup.py

http://bazaar.launchpad.net/~barry/flufl.enum/trunk/view/head:/setup.py

Cheers,
-Barry
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