itertools中的排列无法打印所有排列
[英]permutations in itertools cant print all permutations
问题描述
My question is pretty straight forward:- 
我的问题很简单：
in python itertools why can I get a print of all permutations for say [,r =3]: 在python itertools中，为什么我可以得到所有排列的打印结果，例如[，r = 3]：
>>>import itertools
>>>print list(itertools.permutations([1,2,3], 3))
[(1, 2, 3), (1, 3, 2), (2, 1, 3), (2, 3, 1), (3, 1, 2), (3, 2, 1)]
However only an empty list for [,r >3 eg 10]: 但是，对于[，r> 3例如10]，只有一个空列表：
>>>print list(itertools.permutations([1,2,3], 10))
[]
is there away of getting round this?? 有没有解决这个的办法？
1 个解决方案
解决方案1
0 2015-03-11 13:40:28
As stated in the itertools docs permutations() does not repeat elements. 如itertools docs中所述， permutations()不会重复元素。
I think you want combinations_with_replacement() 我认为您想要combinations_with_replacement()
>>> from itertools import combinations_with_replacement
>>> print list(combinations_with_replacement([1, 2, 3], 10))
[(1, 1, 1, 1, 1, 1, 1, 1, 1, 1), (1, 1, 1, 1, 1, 1, 1, 1, 1, 2), (1, 1, 1, 1, 1, 1, 1, 1, 1, 3), (1, 1, 1, 1, 1, 1, 1, 1, 2, 2), (1, 1, 1, 1, 1, 1, 1, 1, 2, 3), (1, 1, 1, 1, 1, 1, 1, 1, 3, 3), (1, 1, 1, 1, 1, 1, 1, 2, 2, 2), (1, 1, 1, 1, 1, 1, 1, 2, 2, 3), (1, 1, 1, 1, 1, 1, 1, 2, 3, 3), (1, 1, 1, 1, 1, 1, 1, 3, 3, 3), (1, 1, 1, 1, 1, 1, 2, 2, 2, 2), (1, 1, 1, 1, 1, 1, 2, 2, 2, 3), (1, 1, 1, 1, 1, 1, 2, 2, 3, 3), (1, 1, 1, 1, 1, 1, 2, 3, 3, 3), (1, 1, 1, 1, 1, 1, 3, 3, 3, 3), (1, 1, 1, 1, 1, 2, 2, 2, 2, 2), (1, 1, 1, 1, 1, 2, 2, 2, 2, 3), (1, 1, 1, 1, 1, 2, 2, 2, 3, 3), (1, 1, 1, 1, 1, 2, 2, 3, 3, 3), (1, 1, 1, 1, 1, 2, 3, 3, 3, 3), (1, 1, 1, 1, 1, 3, 3, 3, 3, 3), (1, 1, 1, 1, 2, 2, 2, 2, 2, 2), (1, 1, 1, 1, 2, 2, 2, 2, 2, 3), (1, 1, 1, 1, 2, 2, 2, 2, 3, 3), (1, 1, 1, 1, 2, 2, 2, 3, 3, 3), (1, 1, 1, 1, 2, 2, 3, 3, 3, 3), (1, 1, 1, 1, 2, 3, 3, 3, 3, 3), (1, 1, 1, 1, 3, 3, 3, 3, 3, 3), (1, 1, 1, 2, 2, 2, 2, 2, 2, 2), (1, 1, 1, 2, 2, 2, 2, 2, 2, 3), (1, 1, 1, 2, 2, 2, 2, 2, 3, 3), (1, 1, 1, 2, 2, 2, 2, 3, 3, 3), (1, 1, 1, 2, 2, 2, 3, 3, 3, 3), (1, 1, 1, 2, 2, 3, 3, 3, 3, 3), (1, 1, 1, 2, 3, 3, 3, 3, 3, 3), (1, 1, 1, 3, 3, 3, 3, 3, 3, 3), (1, 1, 2, 2, 2, 2, 2, 2, 2, 2), (1, 1, 2, 2, 2, 2, 2, 2, 2, 3), (1, 1, 2, 2, 2, 2, 2, 2, 3, 3), (1, 1, 2, 2, 2, 2, 2, 3, 3, 3), (1, 1, 2, 2, 2, 2, 3, 3, 3, 3), (1, 1, 2, 2, 2, 3, 3, 3, 3, 3), (1, 1, 2, 2, 3, 3, 3, 3, 3, 3), (1, 1, 2, 3, 3, 3, 3, 3, 3, 3), (1, 1, 3, 3, 3, 3, 3, 3, 3, 3), (1, 2, 2, 2, 2, 2, 2, 2, 2, 2), (1, 2, 2, 2, 2, 2, 2, 2, 2, 3), (1, 2, 2, 2, 2, 2, 2, 2, 3, 3), (1, 2, 2, 2, 2, 2, 2, 3, 3, 3), (1, 2, 2, 2, 2, 2, 3, 3, 3, 3), (1, 2, 2, 2, 2, 3, 3, 3, 3, 3), (1, 2, 2, 2, 3, 3, 3, 3, 3, 3), (1, 2, 2, 3, 3, 3, 3, 3, 3, 3), (1, 2, 3, 3, 3, 3, 3, 3, 3, 3), (1, 3, 3, 3, 3, 3, 3, 3, 3, 3), (2, 2, 2, 2, 2, 2, 2, 2, 2, 2), (2, 2, 2, 2, 2, 2, 2, 2, 2, 3), (2, 2, 2, 2, 2, 2, 2, 2, 3, 3), (2, 2, 2, 2, 2, 2, 2, 3, 3, 3), (2, 2, 2, 2, 2, 2, 3, 3, 3, 3), (2, 2, 2, 2, 2, 3, 3, 3, 3, 3), (2, 2, 2, 2, 3, 3, 3, 3, 3, 3), (2, 2, 2, 3, 3, 3, 3, 3, 3, 3), (2, 2, 3, 3, 3, 3, 3, 3, 3, 3), (2, 3, 3, 3, 3, 3, 3, 3, 3, 3), (3, 3, 3, 3, 3, 3, 3, 3, 3, 3)]
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