#13764: CartesianProduct with generators -> silent wrong answer
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Reporter: vbraun | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-5.6
Component: combinatorics | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors: Volker Braun
Merged in: | Dependencies:
Stopgaps: |
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This is actually documented in the docstring:
{{{
sage: def a(n): yield 1*n; yield 2*n
sage: def b(): yield 'a'; yield 'b'
sage: CartesianProduct(a(3), b()).list()
[[3, 'a'], [3, 'b']]
}}}
But by the principle of minimal surprise this should yield an error about
generators and not silently return the wrong answer. Just to illustrate
how dangerous this behavior is note that `sage/combinat/integer_vector.py`
falls precisely into this trap.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13764>
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