Re: [Python-ideas] Support multiplication for sets

Oct. 7, 2011


      2011/10/7 Jakob Bowyer <jkbbwr@gmail.com>:
...
Looking at this from a Math background, it seems that it would be nice for
the set type to support multiplication. This would allow for the
multiplication of sets to produce Cartesian products giving every single
permutation. This would make set usage more intuitive for example;
(assuming python3)
a = set(["amy", "martin"])
b = set(["smith", "jones", "john"])
c = a * b
print(c)
set([('john', 'jones'),
     ('john', 'martin'),
     ('jones', 'john'),
     ('martin', 'amy'),
     ....])
Is your example correct? It does not look like a cartesian product to me.
and what about writing it this way:
    {(x,y) for x in a for y in b}


-- 
Amaury Forgeot d'Arc