bitstring

bitstring is a Python library to help make the creation and analysis of all types of bit-level binary data as simple and efficient as possible. It has been actively maintained since 2006.

The library has has now been downloaded over 100 million times! ✨ ✨

[!NOTE]
To see what been added, improved or fixed, and also to see what's coming in the next version, see the release notes.

Overview

Efficiently store and manipulate binary data in idiomatic Python.
Create bitstrings from hex, octal, binary, files, formatted strings, bytes, integers and floats of different endiannesses.
Powerful binary packing and unpacking functions.
Bit-level slicing, joining, searching, replacing and more.
Create and manipulate arrays of fixed-length bitstrings.
Read from and interpret bitstrings as streams of binary data.
Rich API - chances are that whatever you want to do there's a simple and elegant way of doing it.
Open source software, released under the MIT licence.

Documentation

Extensive documentation for the bitstring library is available.
Some starting points are given below:

There is also an introductory walkthrough notebook on binder.

Examples

Installation

$ pip install bitstring

Creation

>>> from bitstring import Bits, BitArray, BitStream, pack
>>> a = BitArray(bin='00101')
>>> b = Bits(a_file_object)
>>> c = BitArray('0xff, 0b101, 0o65, uint6=22')
>>> d = pack('intle16, hex=a, 0b1', 100, a='0x34f')
>>> e = pack('<16h', *range(16))

Different interpretations, slicing and concatenation

>>> a = BitArray('0x3348')
>>> a.hex, a.bin, a.uint, a.float, a.bytes
('3348', '0011001101001000', 13128, 0.2275390625, b'3H')
>>> a[10:3:-1].bin
'0101100'
>>> '0b100' + 3*a
BitArray('0x866906690669, 0b000')

Reading data sequentially

>>> b = BitStream('0x160120f')
>>> b.read(12).hex
'160'
>>> b.pos = 0
>>> b.read('uint12')
352
>>> b.readlist('uint12, bin3')
[288, '111']

Searching, inserting and deleting

>>> c = BitArray('0b00010010010010001111')   # c.hex == '0x1248f'
>>> c.find('0x48')
(8,)
>>> c.replace('0b001', '0xabc')
>>> c.insert('0b0000', pos=3)
>>> del c[12:16]

Arrays of fixed-length formats

>>> from bitstring import Array
>>> a = Array('uint7', [9, 100, 3, 1])
>>> a.data
BitArray('0x1390181')
>>> a[::2] *= 5
>>> a
Array('uint7', [45, 100, 15, 1])

_{Copyright (c) 2006 - 2025 Scott Griffiths}

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bitstring

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