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Groups > comp.lang.python > #98697
| From | <paul.hermeneutic@gmail.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: new to python, help please !! |
| Date | 2015-11-12 07:27 -0700 |
| Message-ID | <mailman.270.1447338456.16136.python-list@python.org> (permalink) |
| References | <93aef8e5-3d6f-41f4-a625-cd3c2007686e@googlegroups.com> <obL0y.222880$6i2.63495@fx35.am4> <5644005e$0$2932$c3e8da3$76491128@news.astraweb.com> <8737wbu49x.fsf@elektro.pacujo.net> <20151112054812.3603d4de@bigbox.christie.dr> |
Would some form of subprocess.Popen() on cmp or fc /b be easier?
On Nov 12, 2015 7:13 AM, "Tim Chase" <python.list@tim.thechases.com> wrote:
> On 2015-11-12 08:21, Marko Rauhamaa wrote:
> > And if you really wanted to compare two files that are known to
> > contain MD5 checksums, the simplest way is:
> >
> > with open('f1.md5') as f1, open('f2.md5') as f2:
> > if f1.read() == f2.read():
> > ...
> > else:
> > ...
>
> Though that suffers if the files are large. Might try
>
> CHUNK_SIZE = 4 * 1024 # read 4k chunks
> # chunk_offset = 0
> with open('f1.md5') as f1, open('f2.md5') as f2:
> while True:
> c1 = f1.read(CHUNK_SIZE)
> c2 = f2.read(CHUNK_SIZE)
> if c1 or c2:
> # chunk_offset += 1
> if c1 != c2:
> not_the_same(c1, c2)
> # not_the_same(chunk_offset * CHUNK_SIZE, c1, c2)
> break
> else: # EOF
> the_same()
> break
>
> which should perform better if the files are huge
>
> -tkc
>
>
>
> --
> https://mail.python.org/mailman/listinfo/python-list
>
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new to python, help please !! Anas Belemlih <anas.belemlih@gmail.com> - 2015-11-11 08:34 -0800
Re: new to python, help please !! John Gordon <gordon@panix.com> - 2015-11-11 16:58 +0000
Re: new to python, help please !! Tim Chase <python.list@tim.thechases.com> - 2015-11-11 11:06 -0600
Re: new to python, help please !! Ben Finney <ben+python@benfinney.id.au> - 2015-11-12 04:16 +1100
Re: new to python, help please !! Quivis <quivis@domain.invalid> - 2015-11-11 17:48 +0000
Re: new to python, help please !! Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-11-12 13:58 +1100
Re: new to python, help please !! Marko Rauhamaa <marko@pacujo.net> - 2015-11-12 08:21 +0200
Re: new to python, help please !! Tim Chase <python.list@tim.thechases.com> - 2015-11-12 05:48 -0600
Re: new to python, help please !! <paul.hermeneutic@gmail.com> - 2015-11-12 07:27 -0700
Re: new to python, help please !! Quivis <quivis@domain.invalid> - 2015-11-12 17:55 +0000
Re: new to python, help please !! Denis McMahon <denismfmcmahon@gmail.com> - 2015-11-12 19:49 +0000
Re: new to python, help please !! Peter Otten <__peter__@web.de> - 2015-11-12 15:56 +0100
Re: new to python, help please !! Tim Chase <python.list@tim.thechases.com> - 2015-11-12 09:00 -0600
Re: new to python, help please !! Peter Otten <__peter__@web.de> - 2015-11-12 16:41 +0100
Re: new to python, help please !! Denis McMahon <denismfmcmahon@gmail.com> - 2015-11-12 21:24 +0000
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