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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Fri, 21 Sep 2012 11:32:20 -0600
Subject: Re: how to do draw pattern with python?
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Xref: csiph.com comp.lang.python:29658

On Fri, Sep 21, 2012 at 10:50 AM, Ismael Farf=E1n <sulfurfff@gmail.com> wro=
te:
> 2012/9/21 Peter Otten <__peter__@web.de>:
>> echo.hping@gmail.com wrote:
>>
>>     print "\x1b[2J\x1b[0;0H" # optional
>
> Nice code : )
>
> Could you dissect that weird string for us?
>
> It isn't returning the cursor to (0,0), it's just like executing
> clear(1), and looks like those line coloring scape sequences for bash.

They're called "ANSI escape codes". :-)

CSI 2J clears the screen.
CSI 0;0H means "move the cursor to row 0, column 0".  However, I don't
think that's valid ANSI, as the coordinates are 1-based.  Probably it
should have been "\x1b[2J\x1b[1;1H".