Python - permutações usando a biblioteca itertools

	# First, import itertools:
	# source: http://stackoverflow.com/questions/104420/how-to-generate-all-permutations-of-a-list-in-python
	import itertools
	# Permutation:
	print list(itertools.permutations([1,2,3,4], 2))
	[(1, 2), (1, 3), (1, 4),
	(2, 1), (2, 3), (2, 4),
	(3, 1), (3, 2), (3, 4),
	(4, 1), (4, 2), (4, 3)]
	# Combination (order matters):
	print list(itertools.combinations('123', 2))
	[('1', '2'), ('1', '3'), ('2', '3')]
	#Cartesian product (with several iterables):
	print list(itertools.product([1,2,3], [4,5,6]))
	[(1, 4), (1, 5), (1, 6),
	(2, 4), (2, 5), (2, 6),
	(3, 4), (3, 5), (3, 6)]
	#Cartesian product (with one iterable and itself):
	print list(itertools.product([1,2], repeat=3))
	[(1, 1, 1), (1, 1, 2), (1, 2, 1), (1, 2, 2),
	(2, 1, 1), (2, 1, 2), (2, 2, 1), (2, 2, 2)]

view raw gistfile1.py hosted with ❤ by GitHub