How to input one char at a time from stdin?

[Brent W. Hughes]

I'd like to get a character from stdin, perform some action, get another
character, etc. If I just use stdin.read(1), it waits until I finish typing
a whole line before I can get the first character. How do I deal with this?

Brent

[Swaroop C H]

Re: How to input one char at a time from stdin?

On Tue, 25 Jan 2005 12:38:13 -0700, Brent W. Hughes
<brent.hughes@c omcast.net> wrote:[color=blue]
> I'd like to get a character from stdin, perform some action, get another
> character, etc. If I just use stdin.read(1), it waits until I finish typing
> a whole line before I can get the first character. How do I deal with this?[/color]

This is exactly what you need:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/134892

Title: "getch()-like unbuffered character reading from stdin on both
Windows and Unix"

This recipe was a lifesaver for me once :-)

Regards,
--
Swaroop C H
Blog: http://www.swaroopch.info
Book: http://www.byteofpython.info

[Steven Bethard]

Re: How to input one char at a time from stdin?

Swaroop C H wrote:[color=blue]
> On Tue, 25 Jan 2005 12:38:13 -0700, Brent W. Hughes
> <brent.hughes@c omcast.net> wrote:
>[color=green]
>>I'd like to get a character from stdin, perform some action, get another
>>character, etc. If I just use stdin.read(1), it waits until I finish typing
>>a whole line before I can get the first character. How do I deal with this?[/color]
>
>
> This is exactly what you need:
> http://aspn.activestate.com/ASPN/Coo.../Recipe/134892
> Title: "getch()-like unbuffered character reading from stdin on both
> Windows and Unix"
>
> This recipe was a lifesaver for me once :-)[/color]

Thanks for the link! I've seen this question before a few times, but no
one had pointed out the recipe.

Steve

[John Machin]

Re: How to input one char at a time from stdin?

On Wed, 26 Jan 2005 01:15:10 +0530, Swaroop C H <swaroopch@gmai l.com>
wrote:
[color=blue]
>On Tue, 25 Jan 2005 12:38:13 -0700, Brent W. Hughes
><brent.hughes@ comcast.net> wrote:[color=green]
>> I'd like to get a character from stdin, perform some action, get another
>> character, etc. If I just use stdin.read(1), it waits until I finish typing
>> a whole line before I can get the first character. How do I deal with this?[/color]
>
>This is exactly what you need:
>http://aspn.activestate.com/ASPN/Coo.../Recipe/134892
>Title: "getch()-like unbuffered character reading from stdin on both
>Windows and Unix"[/color]

Nice to know how, but all those double underscores made my eyes bleed.
Three classes? What's wrong with something simple like the following
(not tested on Unix)?


import sys
bims = sys.builtin_mod ule_names
if 'msvcrt' in bims:
# Windows
from msvcrt import getch
elif 'termios' in bims:
# Unix
import tty, termios
def getch():
fd = sys.stdin.filen o()
old_settings = termios.tcgetat tr(fd)
try:
tty.setraw(sys. stdin.fileno())
ch = sys.stdin.read( 1)
finally:
termios.tcsetat tr(fd, termios.TCSADRA IN, old_settings)
return ch
else:
raise NotImplementedE rror, '... fill in Mac Carbon code here'