shelve.open generates (22, 'Invalid argument') Os X 10.5 with Python 2.5

[Ned Deily]

In article 
<7a9d26a8-0a9f-4bf3-bf50-0ac5e337f482 at r24g2000yqd.googlegroups.com>,
 seth <hklasky at gmail.com> wrote:
> We have a code that creates a simple Python shelve database. We are
> able to serialize objects and store them in the dbm file. This seem to
> work the same on Windows XP Python 2.5, Ubuntu 9.1 with Python 2.6,
> but on Os X 10.5 with Python 2.5 the database filename is changed by
> the operating system by attaching the .db extension to it. Does an one
> know why is that?

It's a documented "feature": it depends on the underlying database 
package used by shelve.

http://docs.python.org/library/shelve.html

"As a side-effect, an extension may be added to the filename ..."

-- 
 Ned Deily,
 nad at acm.org