[Distutils] Looking for portable what to determine directory where extensions are installed?

[Tres Seaver]

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Toshio Kuratomi wrote:
> On Wed, Nov 11, 2009 at 09:46:25AM -0800, Tom Epperly wrote:
>> I thought distutils.sysconfig.get_python_lib() might be helpful, but it
>> returns "/usr/lib/python2.6/site-packages" even on the system where
>> "/usr/lib64/python2.6/site-packages" is the right answer.
>>
> You're on the right track here.  You just need one more piece of
> information:
> 
> distutils.sysconfig.get_python_lib() will return the path where pure python
> extensions get installed.
> 
> distutils.sysconfig.get_python_lib(1) will return the path where compiled
> extensions get installed.

On my x86_64 Ubuntu box::

 $ uname -a
 Linux mred 2.6.27-15-generic #1 SMP Tue Oct 20 06:50:36 UTC 2009 \
   x86_64 GNU/Linux
 $ which python
 /usr/bin/python
 $ python -c "from distutils.sysconfig import get_python_lib; print
get_python_lib(); print get_python_lib(1); print get_python_lib(0, 1);
print get_python_lib(1, 1)"
 /usr/lib/python2.5/site-packages
 /usr/lib/python2.5/site-packages
 /usr/lib/python2.5
 /usr/lib/python2.5

which is indeed the right answer::

 $ ls -laF /usr/lib/python2.5
 total 7292
 drwxr-xr-x  22 root root  20480 2009-04-29 15:44 ./
 drwxr-xr-x 196 root root  77824 2009-10-25 21:41 ../
 -rw-r--r--   1 root root  33417 2008-10-05 16:59 aifc.py
 ...

even though it is the same answer on my 32-bit box::

 $ uname -a
 Linux scout 2.6.28-16-generic #55-Ubuntu SMP Tue Oct 20 19:48:24 UTC \
   2009 i686 GNU/Linux
 $ which python
 /usr/bin/python
 $ python -c "from distutils.sysconfig import get_python_lib; print
get_python_lib(); print get_python_lib(1); print get_python_lib(0, 1);
print get_python_lib(1, 1)"
 /usr/lib/python2.6/dist-packages
 /usr/lib/python2.6/dist-packages
 /usr/lib/python2.6
 /usr/lib/python2.6
 $ ls -laF /usr/lib/python2.6
 total 8424
 drwxr-xr-x  23 root root  20480 2009-04-20 10:00 ./
 drwxr-xr-x 230 root root  69632 2009-11-11 12:07 ../
 -rw-r--r--   1 root root  13625 2009-04-18 22:43 _abcoll.py
 ...

On a FreeBSD box:

 $ uname -a
 FreeBSD zap20 7.1-RELEASE FreeBSD 7.1-RELEASE #0: Thu Jan  1 08:58:24 \
 UTC 2009     \
 root at driscoll.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC   amd64
 $ which python
 /usr/local/bin//python
 $ python -c "from distutils.sysconfig import get_python_lib; print
get_python_lib(); print get_python_lib(1); print get_python_lib(0, 1);
print get_python_lib(1, 1)"
 /usr/local/lib/python2.5/site-packages
 /usr/local/lib/python2.5/site-packages
 /usr/local/lib/python2.5
 /usr/local/lib/python2.5

I don't have access to a 64-bit box where the right answer would be
'/usr/lib64/python2.x'.



Tres.
- --
===================================================================
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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