On 21/09/12 19:32:20, Ian Kelly wrote:
> On Fri, Sep 21, 2012 at 10:50 AM, Ismael Farfán <sulfur...@gmail.com> wrote:
>> 2012/9/21 Peter Otten <__pete...@web.de>:
>>> echo.hp...@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".
Yes, the coordinates are 1-base, so it should have been
"\x1b[2J\x1b[1;1H". Or, since 1;1 is the default, "\x1b[2J\x1b[H".
On my machine, clear(1) uses "\x1b[H\x1b[2J".
Using clear(1) appears to be the most portable way to do it:
import os, time
data = """\
x....x
.x..x.
..xx..
..xx..
.x..x.
x....x
""".splitlines()
data = [line * 12 for line in data] # optional
try:
while True:
os.system("clear") # optional
for i, line in enumerate(data):
print line
data[i] = line[1:] + line[:1]
time.sleep(.1)
except KeyboardInterrupt:
pass
Hope this helps,
-- HansM
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