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Date: Sat, 22 Sep 2012 03:31:54 +1000
Subject: Re: how to do draw pattern with python?
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:29657

On Sat, Sep 22, 2012 at 2:50 AM, Ismael Farf=E1n <sulfurfff@gmail.com> wrot=
e:
> 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.

It's an ANSI escape sequence, or rather two of them. The first one
clears the screen, the second returns you to 0,0. (Isn't that implicit
in the 2J code? Maybe I'm misremembering.) But it depends on the
terminal responding to them, and not all terminals do. For instance,
most MUD clients parse only a very small subset of ANSI codes, eg
color codes only.

ChrisA