#16522: maxima_calculus is not imported properly
------------------------+----------------------------
Reporter: nbruin | Owner:
Type: defect | Status: new
Priority: minor | Milestone: sage-6.3
Component: calculus | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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We have the problem:
{{{
calculus/all.py:1:from calculus import maxima as maxima_calculus
}}}
This doesn't work, because this is a `LazyImport` proxy, which needs to
know the namespace in which it is bound to do the proper replacement. This
one is tied to `sage.calculus.calculus.maxima`, so it can't rebind the
global `maxima_calculus`. Indeed:
{{{
sage: type(sage.calculus.calculus.maxima)
<type 'sage.misc.lazy_import.LazyImport'>
sage: type(maxima_calculus)
<type 'sage.misc.lazy_import.LazyImport'>
sage: hash(maxima_calculus)
-7971541566211231133
sage: type(sage.calculus.calculus.maxima)
<class 'sage.interfaces.maxima_lib.MaximaLib'>
sage: type(maxima_calculus)
<type 'sage.misc.lazy_import.LazyImport'>
}}}
If instead we do:
{{{
sage: lazy_import('sage.interfaces.maxima_lib','maxima','maxima_calculus')
}}}
we see that things do resolve:
{{{
sage: type(maxima_calculus)
<type 'sage.misc.lazy_import.LazyImport'>
sage: hash(maxima_calculus)
-7971541566211231133
sage: type(maxima_calculus)
<class 'sage.interfaces.maxima_lib.MaximaLib'>
}}}
Other bindings need their own chance to resolve, but do:
{{{
sage: type(sage.calculus.calculus.maxima)
<type 'sage.misc.lazy_import.LazyImport'>
sage: hash(sage.calculus.calculus.maxima)
-7971541566211231133
sage: type(sage.calculus.calculus.maxima)
<class 'sage.interfaces.maxima_lib.MaximaLib'>
}}}
So, the proposed fix: in `calculus.all`, import `maximalib` directly and
lazily, rather than indirectly from `sage.calculus.calculus`. !LazyImports
can't handle indirect imports.
--
Ticket URL: <http://trac.sagemath.org/ticket/16522>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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