[Python] 순열, 조합(itertools.permutations, combinations)

import itertools

alphabet = ['A', 'B', 'C'] # 문자열이나 range로도 가능
print([*itertools.permutations(alphabet)]) # 3개의 원소로 순열
print([*itertools.permutations(alphabet, 2)]) # 2개의 원소로 순열

print()

print([*itertools.combinations(alphabet, 2)]) # 2개의 원소로 조합

출력값
[('A', 'B', 'C'), ('A', 'C', 'B'), ('B', 'A', 'C'), ('B', 'C', 'A'), ('C', 'A', 'B'), ('C', 'B', 'A')]
[('A', 'B'), ('A', 'C'), ('B', 'A'), ('B', 'C'), ('C', 'A'), ('C', 'B')]

[('A', 'B'), ('A', 'C'), ('B', 'C')]

Python Docs (itertools.permutations) 

itertools — Functions creating iterators for efficient looping — Python 3.10.2 documentation

Python Docs (itertools.combinations)

itertools — Functions creating iterators for efficient looping — Python 3.10.2 documentation