Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #58140
| Date | 2013-10-30 18:01 -0500 |
|---|---|
| From | Tim Chase <python.list@tim.thechases.com> |
| Subject | Re: Algorithm that makes maximum compression of completly diffused data. |
| References | <205bfa4f-29de-43de-be5a-72a12d77d0c9@googlegroups.com> <mailman.1825.1383159257.18130.python-list@python.org> <0f857f7f-5947-4b3a-805d-0e9b888dfd48@googlegroups.com> <l4rm20$omr$1@ger.gmane.org> <CAN1F8qU_zJFitGzagQSJqdmEh5h=40ss=ToUcTdC3T783PH10A@mail.gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.1861.1383174007.18130.python-list@python.org> (permalink) |
On 2013-10-30 21:30, Joshua Landau wrote:
> started talking about compressing *random data*
If it's truly random bytes, as long as you don't need *the same*
random data, you can compress it quite easily. Lossy compression is
acceptable for images, so why not random files? :-)
import os
inname = "random.txt"
namez = inname + '.rnz'
# compress the file
with open(outnamez, 'w') as f:
f.write(os.stat(inname).st_size)
# uncompress the file
with open(namez) as f:
size = int(f.read())
with open('/dev/random', 'rb') as rnd, open(inname, 'wb') as out:
for i in range(size):
out.write(rnd.read(1))
There are optimizations that can be made, and I didn't make it run
on Win32, but I leave those as exercises for the reader. That
said, this compresses *remarkably* well for large files ;-)
-tkc
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-10-30 11:21 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-30 18:53 +0000
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-10-30 12:01 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-30 19:18 +0000
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-10-30 12:22 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-30 19:31 +0000
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-10-30 12:23 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-30 19:35 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Ethan Furman <ethan@stoneleaf.us> - 2013-11-02 21:26 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-10-30 20:28 +0100
Re: Algorithm that makes maximum compression of completly diffused data. Joshua Landau <joshua@landau.ws> - 2013-10-30 21:30 +0000
Re: Algorithm that makes maximum compression of completly diffused data. rusi <rustompmody@gmail.com> - 2013-10-31 05:54 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-30 21:52 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Tim Chase <python.list@tim.thechases.com> - 2013-10-30 18:01 -0500
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-10-31 10:41 +1100
Re: Algorithm that makes maximum compression of completly diffused data. Dan Stromberg <drsalists@gmail.com> - 2013-10-30 12:29 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Tim Delaney <timothy.c.delaney@gmail.com> - 2013-10-31 06:35 +1100
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-10-30 12:47 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Modulok <modulok@gmail.com> - 2013-10-30 13:46 -0600
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-10-30 12:47 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Gene Heskett <gheskett@wdtv.com> - 2013-10-30 16:32 -0400
Re: Algorithm that makes maximum compression of completly diffused data. Tim Roberts <timr@probo.com> - 2013-11-02 14:31 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Mark Janssen <dreamingforward@gmail.com> - 2013-11-02 14:37 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-03 03:17 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-03 15:10 +1100
Re: Algorithm that makes maximum compression of completly diffused data. Joshua Landau <joshua@landau.ws> - 2013-11-03 15:34 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Joshua Landau <joshua@landau.ws> - 2013-11-03 15:51 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Mark Janssen <dreamingforward@gmail.com> - 2013-11-03 19:40 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Tim Chase <python.list@tim.thechases.com> - 2013-11-04 07:08 -0600
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-11-04 05:53 -0800
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-11-04 06:00 -0800
Re: Algorithm that makes maximum compression of completly diffused
data. Dave Angel <davea@davea.name> - 2013-11-04 08:27 -0600
Re: Algorithm that makes maximum compression of completly diffused data. rusi <rustompmody@gmail.com> - 2013-11-04 06:46 -0800
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-11-04 14:34 -0800
Re: Algorithm that makes maximum compression of completly diffused
data. Dave Angel <davea@davea.name> - 2013-11-04 19:29 -0600
Re: Algorithm that makes maximum compression of completly diffused data. Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-05 04:33 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-05 04:36 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Tim Roberts <timr@probo.com> - 2013-11-07 00:05 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Mark Janssen <dreamingforward@gmail.com> - 2013-11-07 10:59 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Tim Roberts <timr@probo.com> - 2013-11-07 11:22 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-08 09:26 +1100
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-11-07 18:05 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-08 13:17 +1100
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-11-07 18:25 -0800
Re: Algorithm that makes maximum compression of completly diffused data. rusi <rustompmody@gmail.com> - 2013-11-07 18:36 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-08 13:36 +1100
Re: Algorithm that makes maximum compression of completly diffused data. Mark Janssen <dreamingforward@gmail.com> - 2013-11-07 18:43 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-08 04:47 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-11-08 20:09 +1300
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-08 18:21 +1100
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-11-08 07:48 -0800
Re: Algorithm that makes maximum compression of completly diffused data. rusi <rustompmody@gmail.com> - 2013-11-08 07:57 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Ian Kelly <ian.g.kelly@gmail.com> - 2013-11-08 11:48 -0700
Re: Algorithm that makes maximum compression of completly diffused data. "R. Michael Weylandt <michael.weylandt@gmail.com>" <michael.weylandt@gmail.com> - 2013-11-07 21:43 -0500
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-08 14:05 +1100
Re: Algorithm that makes maximum compression of completly diffused data. Roy Smith <roy@panix.com> - 2013-11-07 22:08 -0500
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-08 14:24 +1100
Re: Algorithm that makes maximum compression of completly diffused data. "R. Michael Weylandt <michael.weylandt@gmail.com>" <michael.weylandt@gmail.com> - 2013-11-07 23:05 -0500
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-08 15:06 +1100
Re: Algorithm that makes maximum compression of completly diffused
data. Dave Angel <davea@davea.name> - 2013-11-07 22:12 -0600
Re: Algorithm that makes maximum compression of completly diffused data. Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-08 05:32 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Mark Janssen <dreamingforward@gmail.com> - 2013-11-07 18:24 -0800
Re: Algorithm that makes maximum compression of completly diffused data. Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-11-08 20:16 +1300
Re: Algorithm that makes maximum compression of completly diffused data. Chris Angelico <rosuav@gmail.com> - 2013-11-08 13:27 +1100
Re: Algorithm that makes maximum compression of completly diffused data. Ethan Furman <ethan@stoneleaf.us> - 2013-11-02 21:26 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Mark Janssen <dreamingforward@gmail.com> - 2013-11-02 23:09 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Michael Torrie <torriem@gmail.com> - 2013-11-03 08:14 -0700
Re: Algorithm that makes maximum compression of completly diffused data. jonas.thornvall@gmail.com - 2013-10-30 12:49 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Grant Edwards <invalid@invalid.invalid> - 2013-10-30 21:18 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Mark Janssen <dreamingforward@gmail.com> - 2013-10-30 14:26 -0700
Re: Algorithm that makes maximum compression of completly diffused data. Dave Angel <davea@davea.name> - 2013-10-31 03:22 +0000
Re: Algorithm that makes maximum compression of completly diffused data. Gene Heskett <gheskett@wdtv.com> - 2013-11-03 04:50 -0500
csiph-web