How to translate a stream of '0' and '1' to characters?

Question

I'm trying to translate a stream of 0, 1 to characters, without using other libraries,

for example 'Hello World':

0100100001000101010011000100110001001111001000000101011101001111010100100100110001000100

I found something like this:

def BinaryToString(binary):
    bingen = (binary[i:i+7] for i in range(0, len(binary), 7))
    return ''.join(chr(eval('0b'+n)) for n in bingen)

but when I'm trying to translate, this is the answer:

>>> BinaryToString("0100100001000101010011000100110001001111001000000101011101001111010100100100110001000100")
"$\x11)Db<@W'TID\x04"
>>>

It is converting Binary to ASCII, then String. Check this one: https://stackoverflow.com/questions/7396849/convert-binary-to-ascii-and-vice-versa — CY_, Dec 12 '18 at 13:46
Thank you Kelvin, but i forgot to mention without other libraries — Dor Lugasi-Gal, Dec 12 '18 at 13:52

Bill the Lizard · Accepted Answer · 2018-12-12T13:53:18.580

1

That function is taking 7 binary digits at a time and converting them to a character. Change it to convert 8 digits at a time.

def BinaryToString(binary):
    bingen = (binary[i:i+8] for i in range(0, len(binary), 8))
    return ''.join(chr(eval('0b'+n)) for n in bingen)

This all depends on how your original text is encoded to begin with, but it works with the example you provided. (ASCII was originally defined using 7 bits. The extended ASCII table uses 8.)

edited Dec 12 '18 at 13:53

answered Dec 12 '18 at 13:49

Bill the Lizard

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Don't use `eval`. `int("1") == 1` and `int("0") == 0`; that's all you need. – chepner Dec 12 '18 at 13:55
1

@chepner Yes, that is probably slower than it needs to be. You can replace `eval('0b'+n)` with `int('0b'+n, 2)` and it works the same (in Python 3). – Bill the Lizard Dec 12 '18 at 13:58
1

You don't need the `0b` prefix if you use `int`. – chepner Dec 12 '18 at 14:05

score 1 · Answer 2 · answered Dec 12 '18 at 13:58

int takes a second argument to specify the base, so you can just use something like int("00001110", 2) to get 14.

>>> binary = "0100100001000101010011000100110001001111001000000101011101001111010100100100110001000100"
>>> ''.join([chr(int(binary[i:i+8], 2)) for i in range(0, len(binary), 8)])
'HELLO WORLD'

How to translate a stream of '0' and '1' to characters?

2 Answers2