[Tutor] Writing to the terminal?

[Wayne Werner]

On Fri, Dec 10, 2010 at 2:38 PM, Corey Richardson <kb1pkl at aim.com> wrote:

>
>
> On 12/10/2010 3:34 PM, Wayne Werner wrote:
>
>> If you just want a single line you can use chr(13) which is a carriage
>> return. If you want a more complex program you'll need a curses type
>> library
>> hth, wayne
>>
>> On 12/10/10, Modulok<modulok at gmail.com>  wrote:
>>
>>> List,
>>>
>>> Forgive me if I don't describe this well, I'm new to it:
>>>
>>> Assume I'm working in a command shell on a terminal. Something like
>>> tcsh on xterm, for example. I have a program which does *something*.
>>> Let's say it counts down from 10. How do I print a value, and then
>>> erase that value, replacing it with another value? Say I had something
>>> like '10' that appears, then wait a second, then the 10 is replaced by
>>> '9'... '8'.. and so forth. The point is, I don't want to print to a
>>> new line, nor do I want the new number to appear next to the previous
>>> number... I just want to change it in place. (If that makes any
>>> sense?) Think of console based progress counters in programs like
>>> fetch or wget, or lame.
>>>
>>> How do you do this in Python?
>>> -Modulok-
>>> _______________________________________________
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>>>
> Try that in the interactive interpreter, it doesn't work.
> >>> print "a" + chr(13)
> a
> (Python 2.6.6)
>

Actually, it does:
 >>> print 'a' + chr(13) + 'b'
b

The cursor moves back, you just didn't bother to overwrite the 'a'.

HTH,
Wayne
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