Converting a string of 1's and 0's to a byte array

I have a string with a length that is a multiple of 8 that contains only 0's and 1's. I want to convert the string into a byte array suitable for writing to a file. For instance, if I have the string "0010011010011101", I want to get the byte array [0x26, 0x9d], which, when written to file, will give 0x269d as the binary (raw) contents.

How can I do this in Python?

Answers


py> data = "0010011010011101"
py> data = [data[8*i:8*(i+1)] for i in range(len(data)/8)]
py> data
['00100110', '10011101']
py> data = [int(i, 2) for i in data]
py> data
[38, 157]
py> data = ''.join(chr(i) for i in data)
py> data
'&\x9d'

You could do something like this:

>>> s = "0010011010011101"
>>> [int(s[x:x+8], 2) for x in range(0, len(s), 8)]
[38, 157]

Your question shows a sequence of integers, but says "array of bytes" and also says "when written to file, will give 0x269d as the binary (raw) contents". These are three very different things. I think you've over-specified. From your various comments it looks like you only want the file output, and the other descriptions were not what you wanted.

If you want a sequence of integers, look at Greg Hewgill's answer.

If you want a sequence of bytes (as in a string) -- which can be written to a file -- look at Martin v. Löwis answer.

If you wanted an array of bytes, you have to do this.

import array
intList= [int(s[x:x+8], 2) for x in range(0, len(s), 8)]
byteArray= array.array('B', intList)

Need Your Help

Reading Metadata from Instruction

llvm

I want to extract all metadata information attached to a instruction. I tried to extract this information using getAllMetadata.

Git - how to roll back all changes to last commit?

git commit revert

I accidently deleted source directory.. I thought I was deleting another directory. But I have last commit that is where I need to revert back.

About UNIX Resources Network

Original, collect and organize Developers related documents, information and materials, contains jQuery, Html, CSS, MySQL, .NET, ASP.NET, SQL, objective-c, iPhone, Ruby on Rails, C, SQL Server, Ruby, Arrays, Regex, ASP.NET MVC, WPF, XML, Ajax, DataBase, and so on.