Jeff Epler <jepler@unpythonic.net> writes:
> On Tue, Dec 03, 2002 at 03:59:05AM -0500, Guido van Rossum wrote:
>> Alas, the current import hooking mechanisms don't allow control over
>> this (the interpretation of * is hardcoded). Feel free to suggest an
>> API and/or implementation of a hook for that, after reading how it's
>> done now. The crucial code is import_all_from() in ceval.c.
>
> Currently __all__ is a list of all the attributes to be exported by the
> module. What if we let __all__ be a list (with its current
> interpretation) or a callable.
>
> If __all__ is callable, then it is called with two parameters: the
> importing module, and the imported module. It can perform the desired
> operation. Any returned value is ignored, any raised exception is
> propagated.
>
> In David Abraham's case, the hook might look something like this:
>
> def __all__(exporter, importer):
> for name, attr in vars(exporter).items():
> if name.startswith('_'): continue
> if isinstance(attr, Multimethod):
> merge_one_multimethod(importer, name, attr)
> else:
> setattr(importer, name, method)
>
> (David, apologies if I've simplified this too much. All I know about
> your desired functionality is that you want to "merge multimethods", and
> I have some idea what a multimethod is..)
Nice; I think this pretty much captures what my users are after.
--
David Abrahams
dave@boost-consulting.com * http://www.boost-consulting.com
Boost support, enhancements, training, and commercial distribution
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