anadionisio...@gmail.com wrote: > Hello! > I have this lists with information and I need to make a "tree" by > associating the information inside the lists. For example: > > l1 = [apple, pear] > l2 = [dog, cat] > l3 = [fork, spoon] > > And I need to make something like this: > > l4 = [apple, dog, fork] > l5 = [apple, dog, spoon] > l6= [apple, cat, fork] > l7 = [apple, cat, spoon] > l8 = [pear, dog, fork] > etc... > > How can I do this? I could use "for" cycles and "if...else" but with > larger lists it gets complicated > > Is there some simple solution that I can use?
Try itertools.product(): >>> class Name(str): ... def __repr__(self): ... return self ... >>> apple, pear, dog, cat, fork, spoon = map(Name, "apple pear dog cat fork spoon".split()) >>> fruit = [apple, pear] >>> pets = [dog, cat] >>> cutlery = [fork, spoon] >>> from itertools import product >>> for item in product(fruit, pets, cutlery): ... print item ... (apple, dog, fork) (apple, dog, spoon) (apple, cat, fork) (apple, cat, spoon) (pear, dog, fork) (pear, dog, spoon) (pear, cat, fork) (pear, cat, spoon) -- http://mail.python.org/mailman/listinfo/python-list
