Wierd circular import issues can (should) be solved with circular cdef
imports. I think the easiest fix to crazy deps (group theory on calculus)
might be to do something alone the lines of
foo = None
def importcrazydeps():
import sage.foo as localfoo
foo = localfoo
Then have sage.x.package import all package modules and sage.x.all import
sage.package and then run importcrazydeps() on any function.
Perhaps another approach would be in Cython with an import optional foo
(does not throw an exception on failure).
On Tue, Apr 1, 2008 at 1:41 PM, Carl Witty <[EMAIL PROTECTED]> wrote:
>
> On Apr 1, 11:23 am, Robert Bradshaw <[EMAIL PROTECTED]>
> wrote:
> > On Apr 1, 2008, at 10:45 AM, Nick Alexander wrote:
> >
> > > On 1-Apr-08, at 10:36 AM, Gary Furnish wrote:
> >
> > >> Right now pulling in group theory may end up pulling in calculus.
> > >> There are similar issues all over with really tight coupling
> > >> between subsystems. It ought to be possible to use group theory
> > >> (maybe without a feature or two) without calculus and vice versa.
> >
> > > This isn't really a global namespace pollution issue, but it is a
> > > concern. One way to deal with this is to make (more) imports
> > > function or class local. I'm not sure if there are performance
> > > penalties for this, especially in Cython. Can anyone say?
> >
> > Importing locally takes time, even if just to discover the cached
> > import if it has already been done once. This is independent of
> > whether or not the file is in Cython (though the relative overhead
> > may be much greater for a Cythonized function).
>
> For instance, see https://bugs.launchpad.net/cython/+bug/155076, where
> I measure the cost of a local import as around 2 microseconds.
>
> > The order in which things are imported is really, really crazy right
> > now, as anyone trying to hunt down an (easy to trigger) circular
> > references can attest to. It would be great if this could be cleaned
> > up, both for developing Sage and for making things more modular so
> > other projects can benefit from them.
>
> Yes, this would be great!
>
> It seems like it would be very difficult to fix, though.
>
> Carl
> >
>
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