- product: Equivalent to nested for-loops in a generator expression.
- permutations: Return successive r length permutations of elements in the iterable.
- combinations: Return r length subsequences of elements from the input iterable.
- combinations_with_replacement: Return r length subsequences of elements from the input iterable allowing individual elements to be repeated more than once.
import itertools A = [ 1, 2, 3] B = [4] C = [5, 6] print "product example:" s=[ A, B, C ] print list(itertools.product(*s)) print "permutations example:" i = 1 for n in itertools.permutations(A,3): print i,":",n i += 1 print "combinations example:" i = 1 for n in itertools.combinations("ABCD",3): print i,"[:]",n i += 1 print "combinations_with_replacement example:" print list( itertools.combinations_with_replacement("ABD",3))
Output:
product example: [(1, 4, 5), (1, 4, 6), (2, 4, 5), (2, 4, 6), (3, 4, 5), (3, 4, 6)] permutations example: 1 : (1, 2, 3) 2 : (1, 3, 2) 3 : (2, 1, 3) 4 : (2, 3, 1) 5 : (3, 1, 2) 6 : (3, 2, 1) combinations example: 1 [:] ('A', 'B', 'C') 2 [:] ('A', 'B', 'D') 3 [:] ('A', 'C', 'D') 4 [:] ('B', 'C', 'D') combinations_with_replacement example: [('A', 'A', 'A'), ('A', 'A', 'B'), ('A', 'A', 'D'), ('A', 'B', 'B'), ('A', 'B', 'D'), ('A', 'D', 'D'), ('B', 'B', 'B'), ('B', 'B', 'D'), ('B', 'D', 'D'), ('D', 'D', 'D')]
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