Re: [Visualpython-users] Linux installation

[Jacob S. <sch...@ro...>]

Bruce,

Ubuntu Lucid Lynx 10.04
=======================
Python 2.6.5 installed by default
Python 3.1.2 installed from repositories


I find this code in /usr/lib/python3.1/distutils/sysconfig.py
under the function get_python_lib



    if os.name == "posix":
        libpython = os.path.join(prefix,
                                 "lib", "python" + get_python_version())
        if standard_lib:
            return libpython
        elif is_default_prefix and 'PYTHONUSERBASE' not in os.environ
and 'real_prefix' not in sys.__dict__:
            return os.path.join(libpython, "dist-packages")
        else:
            return os.path.join(libpython, "site-packages")



It appears to suggest that the choice is made due to the elif line,
which appears to automatically choose 'site-packages' if you send in a
particular prefix.

Also, I would like to inform you that in my installation (Python 3.1.2),
site-packages is not on the search path, and the folder does not even
exist!

P.S. - Same result as above for my Python 2.6.5 installation

HTH,
Jacob Schmidt

On Mon, 2010-12-20 at 21:35 -0700, Bruce Sherwood wrote:
> I wonder whether someone on the list can help me with a puzzle having
> to do with installing on Linux.
> 
> In acinclude.m4 is the following fragment which attempts to identify
> where to install modules such as Visual:
> 
> [am_cv_python_pythondir=`$PYTHON -c "from distutils import sysconfig;
> print(sysconfig.get_python_lib(0,0,prefix='$PYTHON_PREFIX').replace('\\\\\','/'))"
> 2>/dev/null ||
> echo "$PYTHON_PREFIX/lib/python$PYTHON_VERSION/dist-packages"`]
> 
> When autogen.sh and configure are run before doing a make to build
> Visual, this fragment generates a reference to site-packages, which is
> unfortunate, because on Ubuntu with Python 2.x site-packages is not
> normally on the module search path.
> 
> If on the other hand I execute the following I get a reference to
> dist-packages, as expected and desired:
> 
> from distutils import sysconfig
> print(sysconfig.get_python_lib(0,0,prefix='$PYTHON_PREFIX')
> 
> I can't understand why I'm getting a reference to site-packages in the
> autoconfigure machinery. I'm reluctant to hand-code "dist-packages"
> because for all I know other Linux distributions use site-packages and
> have site-packages on the module search path. (As an aside, I'm
> annoyed that Ubuntu has left site-packages off the search path, though
> I notice that it seems to be back on the search path for Python 3.)
> 
> Bruce Sherwood
> 
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