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Re: python file API

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To python-list@python.org
From Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject Re: python file API
Date Tue, 25 Sep 2012 12:07:16 -0400
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On Tue, 25 Sep 2012 10:58:25 +0100, Oscar Benjamin
<oscar.j.benjamin@gmail.com> declaimed the following in
gmane.comp.python.general:

> On Sep 25, 2012 9:28 AM, "Dennis Lee Bieber" <wlfraed@ix.netcom.com> wrote:
> >
> > On Tue, 25 Sep 2012 08:22:05 +0200, Ulrich Eckhardt
> > <ulrich.eckhardt@dominolaser.com> declaimed the following in
> > gmane.comp.python.general:
> >
> > > Am 24.09.2012 23:49, schrieb Dave Angel:
> > > > And what approach would you use for positioning relative to
> > > > end-of-file?  That's currently done with an optional second
> > >  > parameter to seek() method.
> > >
> > > Negative indices.
> > >
> >
> >         Which still doesn't handle the third seek mode -- relative to
> > current position.
> 
> f.pos += delta
> 
> That's the only part of the proposal that I really think is an improvement
> over the current method:
> 
> f.seek(delta, 1)
> 
> I actually had to google the whence code for relative seeking which I
> wouldn't need to do if it were more descriptive.
> 
> But then I never do relative seeking. I'm pretty sure my programs have
> always either read the whole file in order with no seeking or used random
> access with absolute seeking.
> 
	Okay, I was a bit blind this morning...

	And with the effective demise of tape-drives there's probably not
much difference. I could visualize where the seek mode was part of the
information passed down to a tape drive, making a "seek.current" much
faster than a "seek.set".

	f.pos += delta

would be a "seek.set" and with a naive driver might trigger a rewind to
the start of the tape followed by a seek to the absolute position,
whereas the seek from current location would only move the tape by the
specified amount...

> Oscar
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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Thread

python file API zipher <dreamingforward@gmail.com> - 2012-09-24 14:35 -0700
  Re: python file API Dave Angel <d@davea.name> - 2012-09-24 17:49 -0400
    Re: python file API Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-09-25 08:22 +0200
      Re: python file API Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-09-25 04:19 -0400
        Re: python file API Grant Edwards <invalid@invalid.invalid> - 2012-09-25 14:07 +0000
      Re: python file API Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-09-25 12:07 -0400
      Re: python file API Chris Angelico <rosuav@gmail.com> - 2012-09-26 02:12 +1000
  Re: python file API Chris Kaynor <ckaynor@zindagigames.com> - 2012-09-24 14:58 -0700
  Re: python file API Chris Angelico <rosuav@gmail.com> - 2012-09-25 08:14 +1000
    Re: python file API zipher <dreamingforward@gmail.com> - 2012-09-24 15:36 -0700
      Re: python file API Mark Adam <dreamingforward@gmail.com> - 2012-09-24 21:32 -0500
      Re: python file API Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-09-25 08:27 +0100
      Re: python file API Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-09-25 11:51 +0100
    Re: python file API zipher <dreamingforward@gmail.com> - 2012-09-24 15:36 -0700
      Re: python file API Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-25 02:28 +0000
        Re: python file API Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-09-25 07:25 +0200
          Re: python file API Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-25 07:28 +0000
            Re: python file API Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-09-25 21:40 +0200
    Re: python file API Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-25 01:33 +0000
  Re: python file API Dave Angel <d@davea.name> - 2012-09-24 18:36 -0400
  Re: python file API Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-24 16:37 -0600
    Re: python file API Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-09-25 07:32 +0200
      Re: python file API Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-09-25 04:13 -0400
        Re: python file API Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-09-25 11:53 +0200
      Re: python file API Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-25 03:32 -0600
  Re: python file API Chris Angelico <rosuav@gmail.com> - 2012-09-25 08:57 +1000
  Re: python file API Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-09-25 00:12 +0100
  Re: python file API Chris Kaynor <ckaynor@zindagigames.com> - 2012-09-24 16:14 -0700
  Re: python file API Ramchandra Apte <maniandram01@gmail.com> - 2012-09-30 05:50 -0700

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