possible combinations of strings in an array in python?

Question

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

Result must be like this: onetwo,twothree,onethree

itertools.permutations will not work in this situation.

we can do this by simply adding for loops and appending them ,that works for small arrays but takes time for big arrays.
I was wondering is there any way (like itertools.permutations)this can be achieved?

wim · Accepted Answer · 2016-07-22 17:36:31Z

4

Perhaps what you wanted was the itertools.combinations?

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

answered Jul 22, 2016 at 17:36

wim

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Sriker Ch Over a year ago

Is there any way applying this to two different arrays.?I mean arr1=['name1','name2'];arr2=['name3','name4'].output should be name1name3,name1name4,name2name3,name3name4

galaxyan · Accepted Answer · 2016-07-22 18:16:31Z

1

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'])

answered Jul 22, 2016 at 18:16

galaxyan

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