[Distutils] distribute 0.6.10 and convert_2to3_doctests

[Barry Warsaw]

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I have a Python package called 'munepy' <https://launchpad.net/munepy> which
provides yet another flavor of enums.  I'm working on the code for various
reasons and I thought I'd take the opportunity to learn how to support both
Python 2 and 3 from the same code base.

I've updated the code so that it supports Python 2.6 at a minimum, and made it
'python -3' clean.  I've switched it from using setuptools to using
distribute.  I was looking at this page:

    http://packages.python.org/distribute/python3.html

and it seems very cool that distribute can help make my life easier by
allowing me to support both Python 2 and 3 from the same code base.  I set
use_2to3=True in my setup.py and indeed

    % python3 setup.py test

(On Ubuntu 9.10) runs 2to3 over my .py files.  However, my doctests are in
separate .txt files and I cannot seem to get the right incantation for
convert_2to3_doctests.

In the root of my source directory, my doctest lives at
munepy/docs/README.txt, so I put this in my setup.py:

    ...
    use_2to3 = True,
    convert_2to3_doctests = [
        'munepy/docs/README.txt',
        ],
    ...

but I never see that the README.txt is ever 'fixed'.  Indeed, the test fails
because of a syntax error when the doctest tries to print something using
Python 2 syntax.  I'm clearly not using this setup argument correctly, but I
can't tell where I'm going wrong.

How do you use convert_2to3_doctests?

TIA,
- -Barry
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