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Date: Tue, 30 Jul 2013 14:11:33 +0200
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From: Marcus von Appen <mva@freebsd.org>
To: Daniel Braniss <danny@cs.huji.ac.il>
Subject: Re: Dealing with 2.7 and 3.3 installations
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Cc: David Demelier <demelier.david@gmail.com>, bapt@freebsd.org,
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Daniel Braniss <danny@cs.huji.ac.il>:

[...]
>
>>
>> So what you need is support for a python module installed for two different
>> python versions at the same time, correct? And this (right now) is not
>> supported, I am afraid.
>
> as I explained, probably not too well, the problem is in the install from
> ports. the check for the installed  modules does not check, or
> incorrectly checks for the desired version.

That's understood quite well, the (big) problem however are not the  
site-packages,
but other data installed e.g. under /usr/local/share, .../bin, .../wherever,
which currently does not necessarily take the python version into account.

x11-toolkits/py-gtk2 is a good example for such an issue. If you install it
for python2.7 , there are heaps of files, which would conflict/overwrite a
previous python3.2/3.3 installation and vice versa, making the port  
unusable for
all your python installations except one (in the worst case).

> setting FORCE_PKG_REGISTER is a workaround, because it does not
> do any deinstall.

It only is for ports, which keep everything in site-packages or are at least
python-version aware.

Cheers
Marcus