On 2008-05-19 21:26, Brett Cannon wrote:
It is possible to make pickle aware of the module renames, but
that doesn't solve problems with other forms of serialization
or use of the .__module__ attribute in general.
Why can't we just provide a "from __future__ import renamed_modules"
which then provides all the new name to old name mappings in
some form (e.g. module proxies or whatever) and leave the
existing modules in 2.x untouched ?
I have started a discussion on the stdlib SIG on how to handle this,
so I will defer this discussion to there.
Thanks.
But one thing that needs to be decided is if we are ever going to
allow ourselves to rename modules without a major version bump, and if
so how to deal with this problem. I would hope we don't have to wait
another eight years before there is another chance to shift things
around if it becomes apparent that some new package should be
introduced since 2to3 gives us a very nice way to handle the
mechanical aspect of porting code.
We could some kind of module aliasing support to Python.
Backporting name changes would then be a matter of loading
the right aliasing map into the older Python version.
This could probably be done by adding a line
if hasattr(sys, 'module_aliases'):
modname = sys.module_aliases.get(modname, modname)
to the __import__ implementation.
By turning .__module__ into a property and applying the same
aliasing there, we should be able to resolve most technical
issues with a renaming.
Alas, too late to change 2.4 and 2.5 :-/
--
Marc-Andre Lemburg
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