Split binary string into 31bit strings

Question

I have a binary string and I want to split it into 31 bits array

1101000011010010010000001101101011110010010000001101110011000010110110101100101001000000110100101110011001000000110000101101110011001110110000101110100

That is just an example of a binary string but I need it to work for any binary string keeping the integrity of the binary string if I want to rejoin the array. Once the array is made append 0's to the front making sure the length of everything is 31.

Thanks

What do you mean with *binary string*? A string containing only 0s and 1s? — Willem Van Onsem, Mar 28 '17 at 16:52
Also I need to be able to append 0's to make sure the size is 31 of each block — Jack, Mar 28 '17 at 17:05

Keerthana Prabhakaran · Accepted Answer · 2017-03-28T17:24:22.090

1

You can use regex!

Here

{n,m} Matches at least n and at most m occurrences of the preceding expression.

>>> import re
>>> s = '1101000011010010010000001101101011110010010000001101110011000010110110101100101001000000110100101110011001000000110000101101110011001110110000101110100'
>>> re.findall(r'.{,30}''.',s)
['1101000011010010010000001101101', '0111100100100000011011100110000', '1011011010110010100100000011010', '0101110011001000000110000101101', '110011001110110000101110100']

To pad the item which isn't of len 31 with 0's you can use str.ljust

>>> [i.ljust(31,'0') for i in re.findall(r'.{,30}''.',s)]
['1101000011010010010000001101101', '0111100100100000011011100110000', '1011011010110010100100000011010', '0101110011001000000110000101101', '1100110011101100001011101000000']

Time for execution:

0.000314

Hope it helps!

edited Mar 28 '17 at 17:24

answered Mar 28 '17 at 16:57

Keerthana Prabhakaran

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Why would you use a regex if the content clearly does not matter? Furthermore what if the string is **not** a multiple of 31? – Willem Van Onsem Mar 28 '17 at 16:58
Thanks! That was a good catch indeed @WillemVanOnsem. I've added the edits. – Keerthana Prabhakaran Mar 28 '17 at 17:00
Thanks but is there a way to append 0's so all of the strings have equal length?> – Jack Mar 28 '17 at 17:03
I've added the edits! You can use str.ljust over your regex result! – Keerthana Prabhakaran Mar 28 '17 at 17:24

Split binary string into 31bit strings

1 Answers1