Python String Permutations Up To 2 Letter Changes Per Permutation -


how make permutation generator in python limit changes 2 letters?

example:

create_perm('cow')

returns

['cwo', 'woc', 'ocw']

but not 'wco' since mean 3 letters have changed position.

if 2 letters allowed change, boils down swapping 2 letters:

from itertools import combinations  def changetwo(s):     i,j in combinations(range(len(s)), 2):         res = list(s)         res[i], res[j] = res[j], res[i]         yield ''.join(res)

demo:

>>> list(changetwo('cow')) ['ocw', 'woc', 'cwo'] >>> x in changetwo('1234'): ...     x ...  '2134' '3214' '4231' '1324' '1432' '1243'

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