substitute datadir in python script

[Bastien Dalla Piazza]

Hi all,

I'm developing an application with mixed C++ and python.

I wonder how to do the following:

let's assume "alib.la" is a python extention library installed in
$(pyexecdir) which depends on the prefix given by the user.

Up to now, I was substituting the absolute directories path at install
time using "sed" on my scripts source files, so adding to Makefile.am:

ascript.py: ascript_src.py
        sed -e
"s#sys.append('pyexecdir')#sys.append('$(pyexecdir)')#g;s#datadir#
$(datadir)/@PACKAGE@/#g" ascript_src.py > ascript.py

substituting "pyexecdir" in order to allow "import alib" in the
installed scripts and "datadir" to allow access to the installed data
files (like images).

This solution feels a bit clumsy because I need the file names
"ascript_src.py" and "ascript.py" to deferenciate the original and the
substituted files.
I think I need an equivalent in python of the "config.h" header file,
but where to install it? Or is there a standard way to achieve the
substitutions?

Thanks!