Message 159039 - Python tracker

The semantics of "associated application" change considerably from operating system to operating system.  As an example, ``os.startfile("a.py")`` will usually run `a.py` in the Python interpreter, while ``xdg-open a.py`` it will usually open the source code in an editor on Linux.  This might reduce the overall usefulness of the proposed ``shutil.launch()`` function.