Opened 9 years ago
Closed 9 years ago
#11224 closed enhancement (fixed)
Support for the descriptor protocol for lazy_import'ed objects
Reported by: | nthiery | Owned by: | jason |
---|---|---|---|
Priority: | major | Milestone: | sage-4.7.2 |
Component: | misc | Keywords: | sd31 |
Cc: | rishi, jason, rlm | Merged in: | sage-4.7.2.alpha1 |
Authors: | Nicolas M. Thiéry | Reviewers: | Mike Hansen |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
This patch enable to lazy import objects using the descriptor protocol (readonly at this point: just the get method).
A sample application taken from the doc::
Here we show how to take a function in a module, and lazy import it as a method of a class. For the sake of this example, we add manually a function in sage.all:: sage: def my_method(self): return self sage: sage.all.my_method = my_method Now we lazy import it as a method of a new class ``Foo``:: sage: from sage.misc.lazy_import import LazyImport sage: class Foo: ... my_method = LazyImport('sage.all', 'my_method') Now we can use it as a usual method:: sage: Foo().my_method() <__main__.Foo instance at ...> sage: Foo.my_method <unbound method Foo.my_method> sage: Foo().my_method <bound method Foo.my_method of <__main__.Foo instance at ...>> Currently, ``my_method`` remains a lazy imported object in the class dictionary, even when it has already been used, which is not as efficient as it could be (but see #11003):: sage: type(Foo.__dict__["my_method"]) <type 'sage.misc.lazy_import.LazyImport'>
In practice, I needed this feature for further work on categories and functorial constructions, around #11111 and #10963.
Attachments (1)
Change History (6)
Changed 9 years ago by
comment:1 Changed 9 years ago by
- Keywords sd31 added
- Reviewers set to Mike Hansen
- Status changed from new to needs_review
comment:2 Changed 9 years ago by
- Status changed from needs_review to positive_review
comment:3 Changed 9 years ago by
Thanks for the review!
comment:4 Changed 9 years ago by
- Milestone changed from sage-4.7.1 to sage-4.7.2
comment:5 Changed 9 years ago by
- Merged in set to sage-4.7.2.alpha1
- Resolution set to fixed
- Status changed from positive_review to closed
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Looks good to me.