[Pythonmac-SIG] Re: Extension module binary compatibility

[Bob Ippolito]

On Thursday, Feb 20, 2003, at 16:15 America/New_York, John Ehresman 
wrote:

> On Thu, 2003-02-20 at 15:39, Bob Ippolito wrote:
>> sys.executable is usually enough to tell if it 's framework or not.
>
> Do you look for the substring "Python.framework" in the path of the
> executable?
>
>> However, there is only one 2.2 non-framework interpreter around that
>> lives in /usr/bin.. so I would only do binary distributions for the
>> /usr/bin python right now.  There's at least 3 other pythons around,
>> and you can pretty much let:
>> (a) the people that compiled their own python compile their own 
>> modules
>> (b) let the people distributing their own framework python also
>> distribute all of the binary modules for it
>> (c) let fink maintain their own distribution.
>
> But then there are people like myself that compile stuff and put it in
> /usr/local/bin or even somewhere under my home directory (if I didn't
> have root / administrative privileges).  I think it's preferable to not
> depend on python being in a particular location because then people can
> have more than one version on their machine; e.g. one with debug
> symbols, one without.  Also, it allows people to ship a version of
> python with an application.  We do this with Wing so a user on Linux 
> who
> only has 2.2 on his/her machine can run Wing without also installing
> python version 1.5.2.

You can depend on Apple Python being at /usr/bin/python, if that's not 
Apple python, whoever replaced it broke the rules and deserve to learn 
not to do that :).

As I said, leave any other binary distribution of python modules to the 
maintainers of the distribution... but if you MUST, you can do 
something like this:

# mymodule.py
import sys
_prefix, _ver, _plat = sys.prefix, sys.version[:3], sys.platform
del sys
if sys.platform == 'darwin':
	if (2,3,0) <= _ver < (2,4,0):
		if _prefix.find('Python.framework') != -1:
			from py23framework.mymodule import *
		else:
			from py23.mymodule import *
	elif (2,2,0) <= _ver < (2,3,0):
		if _prefix == '/usr':
			from py22jaguar.mymodule import *
		elif _prefix.startswith('/sw'):
			from py22fink.mymodule import *
		elif _prefix.find('Python.framework') != -1:
			from py22framework.mymodule import *
		else:
			raise ImportError, "Unknown installation of Python 2.2"
	else:
		raise ImportError, "Python %d.%d.%d not supported" % _ver
else:
	raise ImportError, "This module requires OS X"