[Distutils] virtual-python.py, sys.prefix, and Mac

Ian Bicking ianb at colorstudy.com
Sun Sep 16 21:55:19 CEST 2007


Ronald Oussoren wrote:
> 
> On 16 Sep, 2007, at 21:44, Ian Bicking wrote:
> 
>> Ronald Oussoren wrote:
>>> On 15 Sep, 2007, at 18:09, Ian Bicking wrote:
>>>> Hi all.  I'm kind of giving up on workingenv, and have started working
>>>> from virtual-python as a basis instead
>>>> (http://pypi.python.org/pypi/virtualenv/).
>>>>
>>>> So the basic technique here is to copy the executable into
>>>> /ENV/bin/python, and then sys.prefix will be '/ENV'.  The standard
>>>> Python installed on a Mac doesn't seem to do this -- the prefix remains
>>>> '/opt/local/Library/Frameworks/Python.framework/Versions/2.4'
>>>> regardless.  (Custom built Python's on Mac work like normal.)
>>> All framework builds behave as you describe, Modules/getpath.c 
>>> special-cases calculation of sys.prefix for framework builds of 
>>> Python (the prefix is inside the framework regardless of where the 
>>> executable is).
>>
>> Is there any way to effect that calculation?  I.e., in a normal build 
>> that calculation is based on the location of the executable, so 
>> virtualenv moves the executable to effect that.
> 
> Move the framework.

I don't really know what that means...?  What exactly is the framework?


-- 
Ian Bicking : ianb at colorstudy.com : http://blog.ianbicking.org
             : Write code, do good : http://topp.openplans.org/careers


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