Paul Moore wrote: > On 9/21/06, Guido van Rossum <[EMAIL PROTECTED]> wrote: > >>I think one missing feature is a mechanism whereby you can say "THIS >>package (gives top-level package name) lives HERE (gives filesystem >>location of package)" without adding the parent of HERE to sys.path >>for all module searches. I think Phillip Eby's egg system might >>benefit from this. > > > This is pretty easy to do with a custom importer on sys.meta_path. > Getting the details right is a touch fiddly, but it's conceptually > straightforward. > > Hmm, I might play with this - a set of PEP 302 importers to completely > customise the import mechanism. The never-completed "phase 2" of the > PEP included a reimplementation of the built in import mechanism as > hooks. Is there any interest in this actually happening? I've been > looking for an interesting coding project for a while (although I > never have any free time...) > My interest in such a project would be in replacing a bunch of legacy C code with varying implementations of the import mechanism in pure Python strictly according to the dictats of PEP 302, using sys.path_hooks and sys.path (meta_path is for future consideration ;-).
Some readers may remember a lightning talk I gave at OSCON about three years ago. In that I discussed a database structure that allowed different implementations of modules to be loaded according to compatibility requirements established as a result of testing. Although I now have a working database import mechanism based on PEP 302 it's by no means obvious how that can be used exclusively (in other words, replacing the current import mechanism: the present implementation relies on an import of MySQLdb, which has many dependencies that clearly must be importable before the DB mechanism is in place). And I certainly haven't followed up by establishing the compatibility data that such an implementation would require. Has anyone done any work on (for example) zip-only distributions? regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
