#15195: Family cardinality does not catch enough errors
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Reporter: tscrim | Owner: tscrim
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.12
Component: combinatorics | Resolution:
Keywords: Family cardinality | Merged in:
Authors: Travis Scrimshaw | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by tscrim):
* status: new => needs_review
Old description:
> We have the following:
> {{{
> sage: C = CartesianProduct(PositiveIntegers(), [1,2,3])
> sage: C.cardinality()
> +Infinity
> sage: F = Family(C, lambda x: x)
> sage: F.cardinality()
> Throws a TypeError
> }}}
>
> Fixes this by also catching type errors.
New description:
We have the following:
{{{
sage: C = CartesianProduct(PositiveIntegers(), [1,2,3])
sage: C.cardinality()
+Infinity
sage: F = Family(C, lambda x: x)
sage: F.cardinality()
Throws a TypeError
}}}
The problem is that the `cardinality()` tries to run `len()` on an
infinite set, which throws a `TypeError`. Fixes this by also catching type
errors.
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Ticket URL: <http://trac.sagemath.org/ticket/15195#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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