#8327: Implement the universal cyclotomic field, using Zumbroich basis
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Reporter: nthiery | Owner:
Type: enhancement | Status:
needs_review
Priority: major | Milestone: sage-5.6
Component: number fields | Resolution:
Keywords: Cyclotomic field, Zumbroich basis | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Christian Stump, Simon King | Merged in:
Dependencies: #13765, #13826 | Stopgaps:
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Comment (by nbruin):
Replying to [comment:182 stumpc5]:
> Numpy is imported in the cython file for the UCF, and seems to be
imported on startup when doing
>
> {{{
> lazy_import("sage.rings.universal_cyclotomic_field.all","*")
> }}}
>
> but not when doing
>
> {{{
>
lazy_import("sage.rings.universal_cyclotomic_field.universal_cyclotomic_field","UniversalCyclotomicField")
> }}}
Have you taken into account that the first time running, lazy star imports
are not lazy at all? It executes the actual import to cache which symbols
get defined by the star import (the files in `.sage/cache`). I think this
cache presently always gets deleted after `sage -b`. If testing
`startup.py` is the first sage run after that, you cannot expect lazy
behaviour.
This caching strategy has its flaws, but presently we'll have to live with
it.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8327#comment:183>
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