[Pythonmac-SIG] /System/Library vs /Library

[Bob Ippolito]

On May 25, 2004, at 3:08 PM, Glenn Andreas wrote:

> Just so hopefully nobody else hits this problem.
>
> If you have a system that started life as a 10.2 system with python  
> added on, upgraded to 10.3 and run an application that embeds/links to  
> Python.framework, things might not work as expected.
>
> The 10.2 add-on python gets installed in  
> /Library/Frameworks/Python.framework.  10.3 provides  
> /System/Library/Frameworks/Python.framework.  If your app is linked to  
> Python.framework, it will end up with the 10.2 version of  
> Python.framework, and not the 10.3 one, since /Library/Frameworks is  
> searched before /System/Library/Frameworks (see  
> http://developer.apple.com/documentation/MacOSX/Conceptual/ 
> BPFrameworks/Tasks/InstallingFrameworks.html#//apple_ref/doc/uid/ 
> 20002261/TPXREF101).
>
> Even though both of these probably are 2.3 python, if you use PackMan  
> in SLFP to install a module (say, PyObjC), your app that embedded  
> Python via Python.framework won't see it, since it will end up looking  
> in LFP.  You will then swear, remove things, re-install things, try to  
> figure out why system.path on the /usr/bin/python works correctly (and  
> refers to the site package in SLFP where you just installed PyObjC),  
> yet your app is unable to import something you know that you just  
> installed.

We're very aware of it.  This is why we have "how to remove a jaguar  
python" in the FAQ.  The linking-to-the-wrong-framework problem is  
compounded by the fact that if you do have both pythons and you link a  
module intended for one from the other then you will have *both* python  
images in memory and you'll get a version mismatch.

The linking-to-the-wrong-framework problem should be solved for later  
versions of Python 2.3 (I'm not sure which exactly, but I am relatively  
sure that 2.3.3 included the -F fix).  The latter problem has a  
solution for users of Mac OS X 10.3+ and I've produced a patch but it  
is not in CVS, last I checked.

-bob
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