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Re: Opinion on best practice...

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Date Thu, 7 Feb 2013 16:28:17 +1100
Subject Re: Opinion on best practice...
From Chris Angelico <rosuav@gmail.com>
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On Thu, Feb 7, 2013 at 10:46 AM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> Dennis Lee Bieber wrote:
>> Though that is the nice feature of REXX*... Anything that wasn't
>> parsable as a REXX statement was automatically sent to the current
>> command processor.
>
> Nice? Are you being sarcastic? What you're describing sounds like a
> classic "Do What I Mean" system, which invariably end up being followed by
> anguished shouts of "Noooo, I didn't mean that!!!".
>
> If you say "Anything that isn't parsable is automatically sent to the
> shell", it doesn't sound too bad. But when you say "Unparseable junk is
> implicitly treated as code and sent off to be executed by something which
> traditionally tends to be forgiving of syntax errors and has the ability to
> turn your file system into so much garbage", it sounds a tad less
> appealing.

You misunderstand. It's actually a very simple rule. Python follows
C's principle of accepting that any return value from an expression
should be ignored if you don't do anything with it. REXX says that any
"bare expression" used as a statement is implicitly addressed to the
default host, which is usually a shell (though I built myself a MUD
system where the default would send text to the client, and shell
execution required ADDRESS CMD "some_command" explicitly); it's very
simple and doesn't feel like a DWIM system at all.

ChrisA

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Thread

Opinion on best practice... Anthony Correia <akcorreia@gmail.com> - 2013-02-04 20:14 -0800
  Re: Opinion on best practice... Michael Torrie <torriem@gmail.com> - 2013-02-04 23:04 -0700
  Re: Opinion on best practice... Terry Reedy <tjreedy@udel.edu> - 2013-02-05 02:56 -0500
    Re: Opinion on best practice... Grant Edwards <invalid@invalid.invalid> - 2013-02-05 13:23 +0000
  Re: Opinion on best practice... Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2013-02-05 08:56 +0100
    Re: Opinion on best practice... Peter Otten <__peter__@web.de> - 2013-02-05 11:35 +0100
      Re: Opinion on best practice... Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2013-02-05 14:05 +0100
  Re: Opinion on best practice... Grant Edwards <invalid@invalid.invalid> - 2013-02-05 13:22 +0000
    Re: Opinion on best practice... Walter Hurry <walterhurry@lavabit.com> - 2013-02-05 21:01 +0000
      Re: Opinion on best practice... Neil Cerutti <neilc@norwich.edu> - 2013-02-05 21:39 +0000
        Re: Opinion on best practice... Ethan Furman <ethan@stoneleaf.us> - 2013-02-05 14:07 -0800
          Re: Opinion on best practice... Grant Edwards <invalid@invalid.invalid> - 2013-02-05 23:00 +0000
            Re: Opinion on best practice... Chris Angelico <rosuav@gmail.com> - 2013-02-06 10:35 +1100
              Re: Opinion on best practice... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-06 12:55 +1100
                Re: Opinion on best practice... Dan Stromberg <drsalists@gmail.com> - 2013-02-05 18:14 -0800
                Re: Opinion on best practice... Chris Angelico <rosuav@gmail.com> - 2013-02-06 17:16 +1100
                Re: Opinion on best practice... rusi <rustompmody@gmail.com> - 2013-02-05 23:32 -0800
                Re: Opinion on best practice... Grant Edwards <invalid@invalid.invalid> - 2013-02-06 15:18 +0000
                Re: Opinion on best practice... Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-06 12:37 -0500
                Re: Opinion on best practice... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-07 10:46 +1100
                Re: Opinion on best practice... Chris Angelico <rosuav@gmail.com> - 2013-02-07 16:28 +1100
                Re: Opinion on best practice... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-07 06:50 +0000
                Re: Opinion on best practice... Chris Angelico <rosuav@gmail.com> - 2013-02-07 18:49 +1100
                Re: Opinion on best practice... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-08 09:49 +1100
                Re: Opinion on best practice... Chris Angelico <rosuav@gmail.com> - 2013-02-08 17:54 +1100
                Re: Opinion on best practice... Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-08 12:41 -0500
                Re: Opinion on best practice... Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-07 13:54 -0500
                Re: Opinion on best practice... Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-08 09:58 +1100
                Re: Opinion on best practice... Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-08 13:29 -0500
                Re: Opinion on best practice... Chris Angelico <rosuav@gmail.com> - 2013-02-09 11:28 +1100
                Re: Opinion on best practice... John Ladasky <john_ladasky@sbcglobal.net> - 2013-02-08 19:10 -0800
            Re: Opinion on best practice... Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-06 00:33 -0500
              Re: Opinion on best practice... Anssi Saari <as@sci.fi> - 2013-02-06 15:30 +0200
        Re: Opinion on best practice... Grant Edwards <invalid@invalid.invalid> - 2013-02-05 22:59 +0000
          Re: Opinion on best practice... Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-05 17:05 -0700
            Re: Opinion on best practice... Grant Edwards <invalid@invalid.invalid> - 2013-02-06 15:04 +0000
          Re: Opinion on best practice... Neil Cerutti <neilc@norwich.edu> - 2013-02-06 14:20 +0000
            Re: Opinion on best practice... Grant Edwards <invalid@invalid.invalid> - 2013-02-06 15:11 +0000
      Re: Opinion on best practice... Nobody <nobody@nowhere.com> - 2013-02-06 03:32 +0000
        Re: Opinion on best practice... Michael Torrie <torriem@gmail.com> - 2013-02-05 22:07 -0700

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