Combinatorial of elements in Python?

[François Ingelrest]

> > I have 2 (or more) groups of elements, and I want to get all possible
> > unique combinations from all of them. Is there a build-in method to do
> > it?
> >>> ADictionary={"one":["A","B","C","D"],"two":["H","I"]}
> >>> result = set()
> >>> for one in ADictionary["one"]:
> ...     for two in ADictionary["two"]:
> ...         result.add(one + two)
> ...
> >>> result
> set(['CI', 'CH', 'DH', 'DI', 'AI', 'AH', 'BH', 'BI'])

With a list comprehension:

>>> d={"one":["A","B","C","D"],"two":["H","I"]}
>>> [a+b for a in d['one'] for b in d['two']]
['AH', 'AI', 'BH', 'BI', 'CH', 'CI', 'DH', 'DI']