#18411: get rid of CartesianProduct
-------------------------+-------------------------------------------------
Reporter: | Owner:
vdelecroix | Status: needs_review
Type: | Milestone: sage-6.9
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers: Nicolas Thiéry
combinatorics | Work issues:
Keywords: | Commit:
Authors: | 22f8b77a3cc2223863396f8d422fbbeec51d1656
Vincent Delecroix | Stopgaps:
Report Upstream: N/A |
Branch: |
public/18411 |
Dependencies: |
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Comment (by vdelecroix):
If we switch back, only the following fails (from
`sage.combinat.tutorial`):
{{{
sage: Suits = Set(["Hearts", "Diamonds", "Spades", "Clubs"])
sage: Values = Set([2, 3, 4, 5, 6, 7, 8, 9, 10,
....: "Jack", "Queen", "King", "Ace"])
sage: Cards = cartesian_product([Values, Suits])
sage: Hands = Subsets(Cards, 5)
Traceback (most recent call last):
...
AttributeError: 'CartesianProduct_with_category' object has no attribute
'list'
}}}
and the reason is because you can not do the list of `Cards`...
{{{
sage: list(Cards)
Traceback (most recent call last):
...
AttributeError: 'CartesianProduct_with_category' object has no attribute
'list'
}}}
There are of course other ways to fix it, but I found that it was the
simplest. Using `FiniteEnumeratedSet` instead of `Set` in the tutorial
seems unnatural to me since you want to keep it as simple as possible...
Vincent
--
Ticket URL: <http://trac.sagemath.org/ticket/18411#comment:39>
Sage <http://www.sagemath.org>
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