#19628: lazy_import breaks CachedRepresentation
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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: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
Replying to [comment:30 jdemeyer]:
> So, what's your proposal then? Close this ticket as wontfix and change
the lazy_import of `NN` (and similar objects) to a "real" import?
Yes. Or if NN is too expensive to import at startup, adapt the places
where NN is accessed (the count above shows about 10 modules (including
`__main__` and I think some double counting) that reference it via a lazy
import) in a way that triggers the import as soon as NN is accessed (i.e.,
either by accessing NN through a namespace that's lazily imported or via
an accessor function). I don't see a reasonable alternative while
maintaining a semantics model that at least resembles that of python.
The other thing we should do is clean up the mess of mis-lazy_imported
objects. As the list above shows, a lot of lazy_imports don't have a
chance of ever clearing themselves up. The penalty of accessing an object
through a lazy_import isn't that high, but the problem is these things
compound. We already have lazy_imports that point to lazy_imports.
I propose:
- adding a function that gives access to the lazy_import cdef attributes
(probably just by returning a dict that has their values)
- including a doctest that tests if lazy_import objects in sys.modules
dicts reference their own scope.
but perhaps that's better handled on a different ticket.
--
Ticket URL: <http://trac.sagemath.org/ticket/19628#comment:31>
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