#19628: lazy_import breaks CachedRepresentation
-------------------------------------+-------------------------------------
Reporter: cheuberg | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.10
Component: coercion | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/cheuberg/19152 | Commit:
-arb-misc-lazy-import | b21aa6e069182b08aca3cf7c24d6ed24e5926510
Dependencies: | Stopgaps:
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Old description:
> `NN` is a lazy_import and therefore we have
> {{{
> sage: NonNegativeIntegerSemiring() == NN
> False
> }}}
> but
> {{{
> sage: NN == NonNegativeIntegerSemiring()
> True
> sage: NonNegativeIntegerSemiring() == NN._get_object()
> True
> }}}
New description:
`NN` is a lazy_import and therefore we have
{{{
sage: NonNegativeIntegerSemiring() == NN
False
}}}
but
{{{
sage: NN == NonNegativeIntegerSemiring()
True
sage: NonNegativeIntegerSemiring() == NN._get_object()
True
}}}
This gives problems with `CachedRepresentation`:
{{{
sage: from sage.misc.lazy_import import LazyImport
sage: lazyZZ = LazyImport('sage.rings.integer_ring', 'ZZ')
sage: PolynomialRing(lazyZZ, 'x') is PolynomialRing(ZZ, 'x')
False
}}}
--
Comment (by jdemeyer):
Replying to [comment:12 nbruin]:
> We could clean up scopes (but that should happen in basically all
`__all__` files etc.)
Of course, now the question becomes: which scopes? If you can hand me a
list of `dict`s which contain all relevant lazy imports, we can indeed do
something.
> There are many tickets about this, see e.g. #12482
Thanks for the pointer, I fixed this.
--
Ticket URL: <http://trac.sagemath.org/ticket/19628#comment:13>
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