python 数组中字符串的可能组合？

Question

arr=['one','two','three']

结果一定是这样的： onetwo,twothree,onethree

itertools.permutations will not work in this situation.

我们可以通过简单地添加 for 循环并附加它们来做到这一点，这适用于小型数组，但对于大型数组则需要时间。
我想知道有什么方法可以实现吗？(like itertools.permutations)

Answer 1

也许您想要的是 itertools.combinations?

>>> [''.join(comb) for comb in (itertools.combinations(arr, 2))]
['onetwo', 'onethree', 'twothree']

Answer 2

for two lists

• create a list with equal length compare with other list
• zip new list with other list
• put all sublist together
• join list

from itertools import permutations

arr1=['name1','name2']
arr2=['name3','name4']

set( map(lambda x: ''.join(x),reduce( lambda x,y:x+y, [  zip(i,arr1) for i in permutations(arr2,len(arr1)) ] ) ) )

output:

set(['name3name1', 'name3name2', 'name4name1', 'name4name2'])