Re: Backspace does not erase in stdout

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Date	Wed, 7 Dec 2011 01:03:55 +1100
Subject	Re: Backspace does not erase in stdout
From	Chris Angelico <rosuav@gmail.com>
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On Wed, Dec 7, 2011 at 12:21 AM, Rick Johnson
<rantingrickjohnson@gmail.com> wrote:
> *Wise Observer Speculates:* Why on earth are we "21st century slaves"
> to an archaic mid 20th century technology that punches holes in paper
> tape? Anyone?
>
>>>> isinstance(Progress, None)
> True

I'm not sure. Let's see...

* Manned, powered, heavier-than-air flight: A hundred years.
* TCP/IP: Thirty years.
* Sliced bread: Eighty years. (What was the greatest thing BEFORE sliced bread?)
* The English language: A few hundred, depending on how you count

Why are we still eating sliced bread on board aeroplanes while posting
in English on internet forums? Clearly we've made no progress since
then. What language and communication protocol do you propose for the
new python-troll-list?

Getting back to the point though...

The use of 127 for DEL is a consequence of the exact technology of
paper tape. However, the question of whether BS is destructive or not
is separate. Should it parallel other characters (draw character at
cursor then advance cursor, vs retard cursor then erase character at
cursor), or should it parallel cursor movement (eg carriage return,
line feed, vertical tab)? If your BS is defined nondestructively, you
can implement the destructive version with three characters; if it's
defined destructively, you can't implement a nondestructive without
some fiddliness (some systems use characters 28-31 for cursor
movement).

ChrisA

Thread

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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