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Re: new to python, help please !!

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From <paul.hermeneutic@gmail.com>
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Subject Re: new to python, help please !!
Date Thu, 12 Nov 2015 07:27:29 -0700
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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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Thread

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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