Clustering the keys of a dict according to its values

[Bruno Desthuilliers]

bearophileHUGS at lycos.com a écrit :
> Alternative version:
> 
> def cluster(data):
>     d = defaultdict(list)
>     pairs = enumerate(data) if isinstance(data, list) else
> data.iteritems()


What is data is another type of sequence or iterable ?-)



>     for k, v in pairs:
>         d[v].append(k)
>     return d
> 
> Bye,
> bearophile