#17814: Make calling a cached method independent of source code inspection
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Reporter: SimonKing | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.6
Component: distribution | Resolution:
Keywords: | Merged in:
Authors: Simon King | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/SimonKing/make_calling_a_cached_method_independent_of_source_code_inspection|
30543e7b283c52cad2fbeb060efe78a74c7b42ba
Dependencies: | Stopgaps:
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Comment (by nbruin):
Replying to [comment:32 jdemeyer]:
> Personally, I still think that [comment:15] is the best solution (but
I'm still open to other suggestions).
This information is cheaply available when cython does its work, We could
ask the cython devs if they would be willing to equip their function
objects with attributes that play the role of `__code__.co_argcount`,
`__code__.co_flags` (to see if `*args` or `**kwds` is present),
`__code__.varnames`, `func_defaults`.
Cython writes the code that splits up the `*args` and `**kwargs` that
python calls at C-API get, and generates errors if it doesn't fit some
internal pattern. For inspection and dynamical code, the required pattern
information should really be made available.
They could either write it into the docstring (as they already do with
source file information) or they could put some attributes on their cython
function objects.
Example:
{{{
sage: cython("""def f(a,b=0): pass""")
sage: f(a=1)
sage: f(b=1)
TypeError: f() takes at least 1 positional argument (0 given)
sage: f(1,c=1)
TypeError: f() got an unexpected keyword argument 'c'
}}}
I think it's quite reasonable if cython would make available what the
number of positional arguments can be and which keyword arguments are
accepted.
--
Ticket URL: <http://trac.sagemath.org/ticket/17814#comment:33>
Sage <http://www.sagemath.org>
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