On Mar 1, 3:43 pm, "Johan S. R. Nielsen" <j.s.r.niel...@mat.dtu.dk>
wrote:
> On Mar 1, 1:56 pm, luisfe <lftab...@yahoo.es> wrote:
>
>
>
>
>
> > No, the lazy_import object keeps wrapping the original object, but
> > when accessing the lazy_import object it imports the real object in
> > the namespace. So, if the lazy_import has not been referenced by
> > another object then it will be collected as garbage. I do not have a
> > running sage right now, but if you experiment you will see that after
> > calling the object the lazy_import object disappears.
>
> > It should be something like:
>
> > {{{
> > sage: from sage.misc.lazy_import import lazy_import
> > sage: lazy_import('sage.rings.all', 'ZZ')
> > sage: a = ZZ
> > sage: type(ZZ)
> > <class 'sage.misc.lazy_import.LazyImport'>
> > sage: ZZ(4.0)
> > 4
> > sage: type(ZZ)
> > <type 'sage.rings.integer_ring.IntegerRing_class'>
> > sage: type(a)
> > <class 'sage.misc.lazy_import.LazyImport'>
>
> > }}}
>
> I just did the above in 4.6.1 and got:
> {{{
> sage: lazy_import('sage.rings.all','ZZ')
> sage: a = ZZ
> sage: type(ZZ)
> <class 'sage.misc.lazy_import.LazyImport'>
> sage: ZZ(4.0)
> 4
> sage: type(ZZ)
> <class 'sage.misc.lazy_import.LazyImport'>}}}
>
> And naturally, the same type for a. It seems nothing I do to the ZZ
> object will unwrap it from the LazyImporter; otherwise, what you say
> would naturally be true, and that was exactly what I thought would be
> neat to do. Even though the wrapping is very thin, if each and every
> callable was wrapped as such, it would probably be quite a large
> performance-penalty.
>
> Johan
Oops, my mistake, I am using a developper version. Try with sage-4.6.2
(to be released this week) the improvement I am talking about was
merged in 4.6.2.alpha3
Also lazy_import('sage.rings.all','ZZ') does not need disk access, is
lazy_import('sage.rings'all','*') what needs to read the file.
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