Re: Backspace does not erase in stdout

From	Grant Edwards <invalid@invalid.invalid>
Newsgroups	comp.lang.python
Subject	Re: Backspace does not erase in stdout
Date	2011-12-06 15:24 +0000
Organization	PANIX Public Access Internet and UNIX, NYC
Message-ID	<jblc3r$sl8$2@reader1.panix.com> (permalink)
References	<4edcecc6$0$29988$c3e8da3$5496439d@news.astraweb.com> <mailman.3305.1323101623.27778.python-list@python.org> <jbir6r$c3$1@reader1.panix.com> <pan.2011.12.06.09.27.42.225000@nowhere.com>

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On 2011-12-06, Nobody <nobody@nowhere.com> wrote:
> On Mon, 05 Dec 2011 16:23:55 +0000, Grant Edwards wrote:
>
>>> Emitting "\b \b" is one very common way to do a destructive backspace.
>>> Inelegant? Perhaps, but a common inelegance.
>> 
>> That's pretty much the only way I've seen it done for the past 25
>> years.
>
> ... before which, it was BS-DEL-BS.
>
> DEL being 127 means that it punches through all of the holes on the
> paper tape, causing whatever was there previously to be replaced with
> a DEL character.


> BS-SPC-BS would only punch through one of the holes.

Ah yes.  And when you read a tape, you silently ignored DEL
characters.  I had completely fogotten about that. I only used paper
tape very briefly, and only for storage, never as a "live" medium for
editing.

-- 
Grant Edwards               grant.b.edwards        Yow! I own seven-eighths of
                                  at               all the artists in downtown
                              gmail.com            Burbank!

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Backspace does not erase in stdout Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-05 16:09 +0000
  Re: Backspace does not erase in stdout Chris Angelico <rosuav@gmail.com> - 2011-12-06 03:13 +1100
    Re: Backspace does not erase in stdout Grant Edwards <invalid@invalid.invalid> - 2011-12-05 16:23 +0000
      Re: Backspace does not erase in stdout Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-05 17:24 +0000
        Re: Backspace does not erase in stdout Grant Edwards <invalid@invalid.invalid> - 2011-12-05 17:40 +0000
          Re: Backspace does not erase in stdout Chris Angelico <rosuav@gmail.com> - 2011-12-06 09:00 +1100
      Re: Backspace does not erase in stdout Nobody <nobody@nowhere.com> - 2011-12-06 09:27 +0000
        Re: Backspace does not erase in stdout Rick Johnson <rantingrickjohnson@gmail.com> - 2011-12-06 05:21 -0800
          Re: Backspace does not erase in stdout Chris Angelico <rosuav@gmail.com> - 2011-12-07 01:03 +1100
          Re: Backspace does not erase in stdout Roy Smith <roy@panix.com> - 2011-12-06 09:49 -0500
        Re: Backspace does not erase in stdout Roy Smith <roy@panix.com> - 2011-12-06 09:45 -0500
        Re: Backspace does not erase in stdout Grant Edwards <invalid@invalid.invalid> - 2011-12-06 15:24 +0000

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