On 19/07/2012 06:41, wolfrage8...@gmail.com wrote:
On Thu, Jul 19, 2012 at 12:16 AM, Dave Angel <d...@davea.name> wrote:
On 07/18/2012 05:07 PM, Jordan wrote:
OK so I have been trying for a couple days now and I am throwing in the
towel, Python 3 wins this one.
I want to convert a string to binary and back again like in this
question: Stack Overflow: Convert Binary to ASCII and vice versa
(Python)
<
http://stackoverflow.com/questions/7396849/convert-binary-to-ascii-and-vice-versa-python
But in Python 3 I consistently get some sort of error relating to the
fact that nothing but bytes and bytearrays support the buffer interface
or I get an overflow error because something is too large to be
converted to bytes.
Please help me and then explian what I am not getting that is new in
Python 3. I would like to point out I realize that binary, hex, and
encodings are all a very complex subject and so I do not expect to
master it but I do hope that I can gain a deeper insight. Thank you all.
test_script.py:
import binascii
test_int = 109
test_int = int(str(test_int) + '45670')
data = 'Testing XOR Again!'
while sys.getsizeof(data) > test_int.bit_length():
test_int = int(str(test_int) + str(int.from_bytes(os.urandom(1), 'big')))
print('Bit Length: ' + str(test_int.bit_length()))
key = test_int # Yes I know this is an unnecessary step...
data = bin(int(binascii.hexlify(bytes(data, 'UTF-8')), 16))
print(data)
data = int(data, 2)
print(data)
data = binascii.unhexlify('%x' % data)
I don't get the same error you did. I get:
File "jordan.py", line 13
test_int = int(str(test_int) + str(int.from_bytes(os.urandom(1),
'big')))
^
test_int = int(str(test_int) + str(int.from_bytes(os.urandom(1), \
'big')))
# That was probably just do to the copy and paste.
IndentationError: expected an indented block
Please post it again, with correct indentation. if you used tabs, then
expand them to spaces before pasting it into your test-mode mail editor.
I only use spaces and this program did not require any indentation until
it was pasted and the one line above became split across two line. Really
though that was a trivial error to correct.
Really? Are you using a forked version of Python that doesn't need
indentation after a while loop, or are you speaking with a forked
tongue? :) Strangely I believe the latter, so please take note of what
Dave Angel has told you and post with the correct indentation.
I'd also recommend you remove a lot of the irrelevant details there. if
you have a problem with hexlfy and/or unhexlify, then give a simple byte
string that doesn't work for you, and somebody can probably identify why
not. And if you want people to run your code, include the imports as well.
My problem is not specific to hexlify and unhexlify, my problem is trying
to convert from string to binary and back. That is why all of the details,
to show I have tried on my own.
Sorry that I forgot to include sys and os for imports.
As it is, you're apparently looping, comparing the byte memory size of a
string (which is typically 4 bytes per character) with the number of
significant bits in an unrelated number.
I suspect what you want is something resembling (untested):
mybytes = bytes( "%x" % data, "ascii")
newdata = binascii.unexlify(mybytes)
I was comparing them but I think I understand how to compare them well,
now I want to convert them both to binary so that I can XOR them together.
Thank you for your time and help Dave, now I need to reply to Ramit.
--
DaveA
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--
Cheers.
Mark Lawrence.
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