permutations/combinations/combinations_with_replacement
代码语言：javascript复制 items = ['a', 'b', 'c']
from itertools import permutations
for p in permutations(items):
... print(p)
...
('a', 'b', 'c')
('a', 'c', 'b')
('b', 'a', 'c')
('b', 'c', 'a')
('c', 'a', 'b')
('c', 'b', 'a')
for p in permutations(items, 2):
... print(p)
...
('a', 'b')
('a', 'c')
('b', 'a')
('b', 'c')
('c', 'a')
('c', 'b')
from itertools import combinations
for c in combinations(items, 3):
... print(c)
...
('a', 'b', 'c')
for c in combinations(items, 2):
... print(c)
...
('a', 'b')
('a', 'c')
('b', 'c')
for c in combinations(items, 1):
... print(c)
...
('a',)
('b',)
('c',)
for c in combinations_with_replacement(items, 3):
... print(c)
...
('a', 'a', 'a')
('a', 'a', 'b')
('a', 'a', 'c')
('a', 'b', 'b')
('a', 'b', 'c')
('a', 'c', 'c')
('b', 'b', 'b')
('b', 'b', 'c')
('b', 'c', 'c')
('c', 'c', 'c')
