Python排列组合实验
import itertools排列: 4个数内选2个
>>> print list(itertools.permutations(,2))
[(1, 2), (1, 3), (1, 4), (2, 1), (2, 3), (2, 4), (3, 1), (3, 2), (3, 4), (4, 1), (4, 2), (4, 3)]
组合：4个数内选2个：
>>> print list(itertools.combinations(,2))
[(1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)]
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ABCDE 5个数的排列(去掉重复):
>>>len(set(list(itertools.permutations(['A','B','C','D','E'],5))))
120
AABCD 5个数不同的排列(去掉重复):
>>>len(set(list(itertools.permutations(['A','A','B','C','D'],5))))
60
AABBC(去掉重复):
>>> len(set(list(itertools.permutations(['A','A','B','B','C'],5))))
30
AAABC(去掉重复):
>>> len(set(list(itertools.permutations(['A','A','A','B','C'],5))))
20
AAABB(去掉重复):
>>> len(set(list(itertools.permutations(['A','A','A','B','B'],5))))
10
AAAAB(去掉重复):
>>> len(set(list(itertools.permutations(['A','A','A','A','B'],5))))
5
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