How to change bits in byte with python?

Question

I have .bmp picture and I need to make some steganography with it.

For this action I have to convert .bmp to list of bytes and then make some changes in bits.

I use open() with "rb" parameter to make bytes list and then convert each byte to string using '{0:08b}'.format(mybyte).

My question is how to convert this string representation of byte back to byte? maybe there are some faster or more correct ways to work with bits?

You want a [bit string or bit array](https://www.google.com/search?q=python+bit+array+or+bitstring). — Jonathon Reinhart, May 15 '14 at 06:10

score 1 · Accepted Answer · answered May 15 '14 at 06:35

1

int constructor can do this very easily :

>>> s = '{0:08b}'.format(42)
>>> s
'00101010'
>>> int(s, 2)
42

answered May 15 '14 at 06:35

Grapsus

2,714
15
14

score 0 · Answer 2 · answered May 15 '14 at 06:23

0

Use binascii module.

Ex:

binascii.a2b_hex('A0')

answered May 15 '14 at 06:23

fred.yu

865
7
10

How to change bits in byte with python?

2 Answers2