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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Opinion on best practice...
Date: Fri, 08 Feb 2013 12:41:06 -0500
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Xref: csiph.com comp.lang.python:38468

On Fri, 08 Feb 2013 09:49:02 +1100, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> declaimed the following in
gmane.comp.python.general:

> 
> Well, Dennis claims that he *does* do it, and that it is one of the better
> features of REXX. And in the code snippet you published earlier, I saw
> plenty of code intended for the shell, but no CALL statement in sight.
>
	I've not used it in years, but yes... Since on the Amiga many
applications opened a "rexxport" they were candidates for "current
command processor". REXX implementations on Windows and Linux aren't as
flexible -- for the most part the only viable command processor is
spawning a shell to handle one statement (a la Python's os.system() ).

	On the Amiga, one could script the systems text editor by using
something similar to (my manuals are in storage):

/* */
address EDITOR
open "somefile.txt"
3d
i
date('n')
<esc>
save
address COMMAND
copy somefile.txt df0:

(I don't recall the notation used to actually escape out of insert mode.

Translated:

	Define the editor as the command processor
	Editor open file command
	Move down three lines
	Enter insert mode
	Insert current date (date is the REXX data function, what is
inserted is the return value from calling date()
	Exit insert mode
	Save the file
	Revert to the normal command shell
	Use normal shell command to copy the file to the first floppy drive.

	It's the interactive nature seen in the editor portion that is not
easy to perform using Python -- even with subprocess.Popen() and the
various read/write operations.

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