product

데카르트의 곱

import itertools
itertools.product('ABCD', repeat=2)

결과

AA AB AC AD BA BB BC BD CA CB CC CD DA DB DC DD

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permutations

import itertools
itertools.permutations('ABCD', 2)

결과

AB AC AD BA BC BD CA CB CD DA DB DC

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combintations

import itertools
itertools.combinations('ABCD', 2)

결과

AB AC AD BC BC CD

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combinations_with_replacement

import itertools
itertools.combinations_with_replacement('ABCD', 2)

결과

AA AB AC AD BB BC BD CC CD DD

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References

• https://geonlee.tistory.com/69
• https://docs.python.org/2/library/itertools.html