[IPython-user] A bag of pythons on OS X leopard; Is a house cleaning in order.

Barry Wark barrywark@gmail....
Wed Oct 8 11:55:50 CDT 2008

On Wed, Oct 8, 2008 at 1:01 AM, Robin <robince@gmail.com> wrote:
> Hi,
> I am in a similar situation - and generally I don't think you can
> avoid having several copies.
> I believe from earlier discussions on this list it is very much not
> recommended to use the system python for your numpy stuff. This is
> because the Apple system python comes with it's own very old version
> of numpy. Replacing this might have consequences for other Apple
> stuff, and also other third party apps that assume the standard setup.
> In general, one shouldn't mess about with anything in /System since
> that is part of the standard distribution.

Not true. The system python, by default, will put its version of numpy
first on the python path (to protect Apple-installed tools that depend
on numpy). The system python comes with setuptools, however, for a
reason. If you use setuptools to install a more recent version of
numpy, setuptools will take care of putting the new version of numpy
first on the python path while allowing Apple-installed tools to
continue to use the version that shipped with Leopard.

So the general rule is: use setuptools and things will "just work".

> I use MacPorts rather than Fink - but I have the same thing of having
> a python installed through that when I installed a python application.
> I even have numpy installed through that - again an older version -
> that was pulled in as a depenency. I wanted to try and trick the
> macports system to accepting my SVN numpy, but again it seems this is
> very much not recommended so the dependencies in the macports system
> are standard. This is installed in /opt/local/Library/Frameworks with
> symlinks for the python executable in /opt/local/bin. I tihnk with
> fink the prefix is /sw so this is the version you are picking up at
> the moment.
> So I have python.org Python installation for my own use. This installs
> in /Library/Frameworks with symlinks in /usr/local/bin. I have
> setuptools installed in this version, so easy_install installs things
> here.
> On Wed, Oct 8, 2008 at 3:11 AM, Gary Church <gary.church1@comcast.net> wrote:
>> 1. How do I get python 2.6 to come up when I enter "python" at the
>> terminal command line?
> I think you are picking up the fink python. Type
> which python
> to be sure.
> Changing the path should be enough. The Python.org 2.5 package
> installed in /usr/local/bin so I assume the 2.6 does the same. You
> need to make sure this comes before /sw/bin in your path.
> I think putting
> export PATH=/usr/local/bin:$PATH
> at the end of your .bashrc will do it. Maybe also put
> source ~/.bashrc
> in your .bash_profile
> (I'm not sure of the correct way - always find the rc/profile
> distinction a bit confusing).
>> 2. Should I "clean house" of all other pythons on the system and if
>> so, how is that done?
> I don't think so - I don't think it does any harm to have several and
> reduces the chance of  problems with the different components.
>> 3. Do these other pythons interfere with each other in some way? Is it
>> a problem having all these pythons slithering around on my system?
> No - as long as you are always using the one you expect, and other
> things are using the one they expect. Fink python apps should look
> directly for the Fink version, but not all may, so it's something to
> keep in mind.
>> Thanks for any help you can offer,
>> Gary
>> Gary Church
>> gary.church1@comcast.net
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