[Python] ciclo for dentro un ciclo for

[Marco Mariani]

On 03/10/2010 02:20 PM, Giovanni Marco Dall'Olio wrote:


> - itertools.product dovrebbe darti il prodotto cartesiano, ma mi
> sembra che non vi sia almeno in python2.5, e per il momento non te lo
> posso provare (sono su una vecchia ubuntu).
>   

Lo uso tranquillamente sulla 2.5, sono poche righe:

> # itertools.product from python 2.6
> def product(*args, **kwds):
>     pools = map(tuple, args) * kwds.get('repeat', 1)
>     if pools:
>         result = [[]]
>         for pool in pools:
>             result = [x+[y] for x in result for y in pool]
>         for prod in result:
>             yield tuple(prod)


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