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Re: How to write fast into a file in python?

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Date Sun, 19 May 2013 00:29:50 +1000
Subject Re: How to write fast into a file in python?
From Chris Angelico <rosuav@gmail.com>
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On Sat, May 18, 2013 at 5:49 PM, Fábio Santos <fabiosantosart@gmail.com> wrote:
> Putting len(os.linesep)'s value into a local variable will make accessing it
> quite a bit faster. But why would you want to do that?
>
> You mentioned "\n" translating to two lines, but this won't happen. Windows
> will not mess with what you write to your file. It's just that traditionally
> windows and windows programs use \r\n instead of just \n. I think it was for
> compatibility with os/2 or macintosh (I don't remember which), which used \r
> for newlines.
>
> You don't have to follow this convention. If you open a \n-separated file
> with *any* text editor other than notepad, your newlines will be okay.


Into two characters, not two lines, but yes. A file opened in text
mode on Windows will have its lines terminated with two characters.
(And it's old Macs that used to use \r. OS/2 follows the DOS
convention of \r\n, but again, many apps these days are happy with
Unix newlines there too.)

ChrisA

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Thread

How to write fast into a file in python? lokeshkoppaka@gmail.com - 2013-05-16 20:20 -0700
  Re: How to write fast into a file in python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-17 03:51 +0000
  Re: How to write fast into a file in python? lokeshkoppaka@gmail.com - 2013-05-16 21:35 -0700
    Re: How to write fast into a file in python? Dave Angel <davea@davea.name> - 2013-05-17 07:58 -0400
    RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-17 18:20 +0300
      Re: How to write fast into a file in python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-17 16:42 +0000
        RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-17 20:25 +0300
      Re: How to write fast into a file in python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-17 17:47 +0000
        RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-17 21:18 +0300
          Re: How to write fast into a file in python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-18 04:01 +0000
            Re: How to write fast into a file in python? Chris Angelico <rosuav@gmail.com> - 2013-05-18 15:28 +1000
            Re: How to write fast into a file in python? 88888 Dihedral <dihedral88888@googlemail.com> - 2013-05-18 04:09 -0700
        RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-17 21:33 +0300
        RE: How to write fast into a file in python? Fábio Santos <fabiosantosart@gmail.com> - 2013-05-18 08:49 +0100
        Re: How to write fast into a file in python? Chris Angelico <rosuav@gmail.com> - 2013-05-19 00:29 +1000
        RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-18 20:00 +0300
          Re: How to write fast into a file in python? Tim Roberts <timr@probo.com> - 2013-05-19 19:04 -0700
        Re: How to write fast into a file in python? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-05-18 15:14 -0400
          Re: How to write fast into a file in python? Roy Smith <roy@panix.com> - 2013-05-18 15:37 -0400
          Re: How to write fast into a file in python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-18 22:23 +0000
        Re: How to write fast into a file in python? Fábio Santos <fabiosantosart@gmail.com> - 2013-05-18 22:19 +0100
        Re: How to write fast into a file in python? Dave Angel <davea@davea.name> - 2013-05-18 22:41 -0400
        RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-19 06:53 +0300
        Re: How to write fast into a file in python? MRAB <python@mrabarnett.plus.com> - 2013-05-19 16:44 +0100
        RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-20 13:34 +0300
    Re: How to write fast into a file in python? Dan Stromberg <drsalists@gmail.com> - 2013-05-18 12:38 -0700
    RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-19 08:31 +0300
    RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-19 08:42 +0300
    Re: How to write fast into a file in python? Chris Angelico <rosuav@gmail.com> - 2013-05-19 19:21 +1000
    RE: How to write fast into a file in python? Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-19 12:41 +0300

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