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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: How to write fast into a file in python?
Date: Sat, 18 May 2013 15:14:31 -0400
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tOn Sat, 18 May 2013 08:49:55 +0100, Fábio Santos
<fabiosantosart@gmail.com> declaimed the following in
gmane.comp.python.general:


> You mentioned "\n" translating to two lines, but this won't happen. Windows
> will not mess with what you write to your file. It's just that
> traditionally windows and windows programs use \r\n instead of just \n. I
> think it was for compatibility with os/2 or macintosh (I don't remember
> which), which used \r for newlines.
>
	Neither... It goes back to Teletype machines where one sent a
carriage return to move the printhead back to the left, then sent a line
feed to advance the paper (while the head was still moving left), and in
some cases also provided a rub-out character (a do-nothing) to add an
additional character time delay.

	TRS-80 Mod 1-4 used <cr> for "new line", I believe Apple used <lf>
for "new line"... And both lost the ability to move down the page
without also resetting the carriage to the left. In a world where both
<cr><lf> is used, one could draw a vertical line of | by just spacing
across the first line, printing |, then repeat <lf><bkspc>| until done.
To do the same with conventional <lf> is "new line/return" one has to
transmit all those spaces for each line...

	At 300baud, that took time....


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