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Re: new to python, help please !!

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From Tim Chase <python.list@tim.thechases.com>
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Subject Re: new to python, help please !!
Date Thu, 12 Nov 2015 05:48:12 -0600
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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

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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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