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I am trying to implement rsa algorithm. So, I would like to combine array elements based on block size. For example: 

blockSize = 2
arr = [1, 3, 45, 6, 2, 90, 103]

I am willing to merge the elements in a way that 1st and 2nd will be combined into one element. so the array would look like this:

arr = [13, 456, 290, 103]
Abdulla Dlshad
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1 Answers1

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Divide to chunks by block_size, then map all the values in each cell to strings, the join the strings and convert them to integer:

new_arr = [int(''.join(map(str, arr[i: i+block_size]))) for i in range(0, len(arr), block_size)]

More detailed overview on the chunks convertion:

int(''.join(map(str, arr[i: i+block_size])))
                     arr[i: i+block_size]      for every chunk
            map(str, ....................)     map every number in the chunks to string
    ''.join(..............................)    join these strings
int(.......................................)   convert the join string to integer
Uriel
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  • Thank you. it worked for me. but i interpreted it in another way. like this: `for index in range(0, len(arr), bs): new = ''.join( map ( str, arr[index : index + bs] ) ) ` – Abdulla Dlshad Nov 14 '16 at 20:34