Version specific or not?

[Steven W. Orr]

We have an app and I'm trying to decide where the app should be
installed. The question is whether it should be site-specific or not, as
in

/usr/lib/python2.3/site-packages
or
/usr/lib/site-python

The latter would solve a lot of problems for me.

In the case of emacs, most stuff seems to go into $EMACS/site-lisp and far
less into $EMACS/$current_version/site-lisp. The python site dirs seem to
be the opposite. We have lots of stuff in the 2.3/site-packages and very
little in the site-python directory.

If there are multiple versions of python installed on the same machine,
having a shebang that just looked for /usr/bin/python would make my life a
lot easier.

* Since we distribute .pyo files, is there an issue if the .pyo was built
with 2.3.5 and then executed by 2.4 or 2.5?

* Are there any caveats?

TIA

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[Scott David Daniels]

We have an app and I'm trying to decide where the app ... .
/usr/lib/python2.3/site-packages
or
/usr/lib/site-python

The latter would solve a lot of problems for me.

Fewer than you suspect

If there are multiple versions of python installed on the same machine,
having a shebang that just looked for /usr/bin/python would make my life
a lot easier.

* Since we distribute .pyo files, is there an issue if the .pyo was
built with 2.3.5 and then executed by 2.4 or 2.5?

Each python M.N.X has its own byte code for distinct values of M and/or N.
So, if you had a shared directory, not only would your users have to
be able to write to the shared directory (when they import mumble, and
mumble.pyc or mumble.pyo has been generated by a different version of
Python, they will recompile mumble.py and rewrite mumble.pyc (or .pyo).

-Scott David Daniels
(e-mail address removed)

 

[Steve Holden]

Fewer than you suspect



Each python M.N.X has its own byte code for distinct values of M and/or N.
So, if you had a shared directory, not only would your users have to
be able to write to the shared directory (when they import mumble, and
mumble.pyc or mumble.pyo has been generated by a different version of
Python, they will recompile mumble.py and rewrite mumble.pyc (or .pyo).

If the users *don't* have write access to the directory then no
byte-code is stored, and everything has to compile the libraries each
time. So it isn't necessary to have write, but either way sharing
libraries between versions is a pain for the reason you state.

regards
Steve
--
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Skype: holdenweb http://del.icio.us/steve.holden

Sorry, the dog ate my .sigline so I couldn't cat it