CODEWITHSUNDEEP
python-3.xbyteextractlsb
nkg
nkg

Reputation: 961

Extract LSB bit from a Byte in python

I have a byte in variable 'DATA'. I want to extract the LSB bit out of it and print it. I'm very new to python, I found many articles with complex bitwise addition logic and all which was very tough to understand. I'm looking for a simple logic like we do with the strings eg DATA[7:1] Please help me out...

Upvotes: 7

Views: 39309

Answers (3)

fr_andres
fr_andres

Reputation: 6687

Simplest and probably fastest:

least_significant_bit_of_x = x & -x

You can find more tricks here: https://www.informit.com/articles/article.aspx?p=1959565

Although the go-to reference for bitwise "black magic" is Knuth's "The Art of Computer Programming, vol. 1".

Upvotes: 9

ASHISH R
ASHISH R

Reputation: 4189

Right shift by the number n and take the last bit by and 1

num >> n &1

Upvotes: -2

senshin
senshin

Reputation: 10360

Is your "byte" an int? If so, just take bitwise AND (&) with 1 (or, if you want to be more explicit, the binary literal 0b1) to get the least significant bit.

>>> x = 14
>>> x & 1
0
>>> x = 15
>>> x & 1
1

Is your "byte" a bytes object? If so, just index into it and take bitwise AND.

>>> y = bytes([14, 15])
>>> y[0] & 1
0
>>> y[1] & 1
1

Upvotes: 22

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