Wrapping around a list

Peter Pearson ppearson at nowhere.invalid
Wed Nov 27 18:42:30 CET 2013


On Wed, 27 Nov 2013 08:33:43 -0500, Neil Cerutti <mr.cerutti at gmail.com> wrote:
> On Wed, Nov 27, 2013 at 5:46 AM,  <amjadcsu at gmail.com> wrote:
>> I am working on a problem (Bioinformatics domain) where all
>> possible combinations of input string needs to be printed as
>> sublist
>>
>> For example:
>> Input string : "LEQN"
>> Output= "[L","E","Q","N"]
>> ["LE","EQ","QN","NL"]["LEQ","EQN","QNE","NLE"]["LEQN"]
>
> How about itertools.combinations?
>
> import itertools
>
> s = "LEQN"
> for i in range(len(s)):
>     for comb in itertools.combinations(s, i+1):
>         print(comb)
> Output:
> ('L',)
> ('E',)
> ('Q',)
> ('N',)
> ('L', 'E')
> ('L', 'Q')
> ('L', 'N')
> ('E', 'Q')
> ('E', 'N')
> ('Q', 'N')
> ('L', 'E', 'Q')
> ('L', 'E', 'N')
> ('L', 'Q', 'N')
> ('E', 'Q', 'N')
> ('L', 'E', 'Q', 'N')
>
> For some reason I've got more 2-character combinations than you,
> though.

The original poster's combinations comprise letters that are *contiguous*,
in a circular sense.  Yours include non-contiguous sets, like LQ.

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