Linux/Win32 func. to get Python instdir (not exedir) + site-packages => extensions mgmt

[Diez B. Roggisch]

pythonewbie 

> 
> Because the solution using distutils.sysconfig.get_python_lib() is
> very smart !

Depending on your goal. You said 

"""
My goal is to verify if an/several extension(s) are installed and to
automatically install the missing ones on Linux or Win32.
"""

This goal can't be reached with only the site-packages - because I can
install packages somewhere else (matter of factly, this happens on debian
for example, they've split the install-dirs and created a bunch of dirs
under /usr/share)

So having a method that gives you the installation root doesn't help much
here.

Diez