I am sympathetic with this attitude ("Avoid using system Python for anything"), 
but I don't think it's the right one.  For example, the project I'm working on 
(HSC/LSST for astrofolk) is using python/C++ for astronomical imaging, and we 
expect to have the code running on a significant number of end-user laptops.   
If the instructions start out with:
        0. Install a new version of python
it's a significant barrier.  What if they've already involved other packages 
into the system python?

Python is a central part of modern operating systems, and people should not 
have to manage two versions of python to use numpy. It's  tempting to say, 
"First install g++ 4.7 so we can use C++11 features" it's simply not viable, 
and I think that saying, "first install a new python" is comparable.  Yes, I 
know that you can have more than one python/compiler suite installed 
simultaneously, but that's not something for casual users to have to get 
involved in.

                                                        R


> On Sun, Jan 6, 2013 at 2:04 AM, Ralf Gommers <ralf.gomm...@gmail.com> wrote:
>>> Which exact Python do we need to use on Mac? Do we need to use the
>>> binary installer from python.org?
...
> 
>> Avoid using system Python for anything. The first thing to do on any new OS
>> X system is install Python some other way, preferably from python.org.
> 
> +1

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