Python 순열/조합/중복순열/중복조합 구하기

1. 순열

from itertools import permutations

for i in permutations([1,2,3,4], 2):
    print(i, end=" ")

결과

(1, 2) (1, 3) (1, 4) (2, 1) (2, 3) (2, 4) (3, 1) (3, 2) (3, 4) (4, 1) (4, 2) (4, 3) 

 

2. 조합

from itertools import combinations

for i in combinations([1,2,3,4], 2):
    print(i, end=" ")

결과

(1, 2) (1, 3) (1, 4) (2, 3) (2, 4) (3, 4)

 

3. 중복순열

from itertools import product

for i in product([1,2,3],'ab'):
    print(i, end=" ")

결과

(1, 'a') (1, 'b') (2, 'a') (2, 'b') (3, 'a') (3, 'b') 

 

4. 중복조합

from itertools import combinations_with_replacement

for cwr in combinations_with_replacement([1,2,3,4], 2):
    print(cwr, end=" ")

결과

(1, 1) (1, 2) (1, 3) (1, 4) (2, 2) (2, 3) (2, 4) (3, 3) (3, 4) (4, 4)