#15163: sum() in the console is overshadowed by symbolic_sum() ?
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Reporter: darij | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.12
Component: misc | Resolution:
Keywords: prelude, misc, staticmethod | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by darij):
* keywords: prelude => prelude, misc, staticmethod
* component: PLEASE CHANGE => misc
Old description:
> {{{
> sage: c31 = Composition([3,1])
> sage: sum(c31)
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
> <ipython-input-5-cd64b2e19a3e> in <module>()
> ----> 1 sum(c31)
>
> /home/darij/sage-5.11.beta3/local/lib/python2.7/site-
> packages/sage/misc/functional.pyc in symbolic_sum(expression, *args,
> **kwds)
> 652 """
> 653 if hasattr(expression, 'sum'):
> --> 654 return expression.sum(*args, **kwds)
> 655 elif len(args) <= 1:
> 656 return sum(expression, *args)
>
> TypeError: sum() takes exactly 1 argument (0 given)
> }}}
> This should instead return 4 (the sum of the entries of the composition
> c31). This bug appears only interactively; in methods sum() is fine.
>
> The reason why this bug happens in this particular situation is that
> {{{sum}}} is defined as a @staticmethod in the {{{Composition}}} class.
> This method is not supposed to be called on a particular composition (it
> is a @staticmethod after all!), but nevertheless makes
> {{{hasattr(expression, 'sum'):}}} return True when {{{expression}}} is a
> composition. Something should be done about it.
New description:
{{{
sage: c31 = Composition([3,1])
sage: sum(c31)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
<ipython-input-5-cd64b2e19a3e> in <module>()
----> 1 sum(c31)
/home/darij/sage-5.11.beta3/local/lib/python2.7/site-
packages/sage/misc/functional.pyc in symbolic_sum(expression, *args,
**kwds)
652 """
653 if hasattr(expression, 'sum'):
--> 654 return expression.sum(*args, **kwds)
655 elif len(args) <= 1:
656 return sum(expression, *args)
TypeError: sum() takes exactly 1 argument (0 given)
}}}
This should instead return 4 (the sum of the entries of the composition
c31). This bug appears only interactively; in methods sum() is fine.
The reason why this bug happens in this particular situation is that
{{{sum}}} is defined as a @staticmethod in the {{{Composition}}} class.
This method is not supposed to be called on a particular composition (it
is a @staticmethod after all!), but nevertheless makes
{{{hasattr(expression, 'sum')}}} return True when {{{expression}}} is a
composition. Something should be done about it.
--
--
Ticket URL: <http://trac.sagemath.org/ticket/15163#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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