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Groups > comp.lang.python > #16701 > unrolled thread

Single key press

Started bySergi Pasoev <s.pasoev@gmail.com>
First post2011-12-06 10:19 +0430
Last post2011-12-06 07:38 -0800
Articles 9 — 7 participants

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  Single key press Sergi Pasoev <s.pasoev@gmail.com> - 2011-12-06 10:19 +0430
    Re: Single key press 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-05 22:27 -0800
    Re: Single key press 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-05 22:27 -0800
    Re: Single key press alex23 <wuwei23@gmail.com> - 2011-12-06 00:39 -0800
    Re: Single key press Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-06 08:48 +0000
      Re: Single key press Hans Mulder <hansmu@xs4all.nl> - 2011-12-06 10:28 +0100
    Re: Single key press Nobody <nobody@nowhere.com> - 2011-12-06 09:48 +0000
    Re: Single key press Grant Edwards <invalid@invalid.invalid> - 2011-12-06 15:22 +0000
      Re: Single key press 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-06 07:38 -0800

#16701 — Single key press

FromSergi Pasoev <s.pasoev@gmail.com>
Date2011-12-06 10:19 +0430
SubjectSingle key press
Message-ID<mailman.3332.1323150597.27778.python-list@python.org>
Hi.

I wonder if it is realistic to get a single key press in Python
without ncurses or
any similar library. In single key press I mean something like j and k
in Gnu less
program, you press the key and and it is captured by the script without need to
press enter afterwards

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#16702

From88888 Dihedral <dihedral88888@googlemail.com>
Date2011-12-05 22:27 -0800
Message-ID<29114360.50.1323152868752.JavaMail.geo-discussion-forums@prcu10>
In reply to#16701
On Tuesday, December 6, 2011 1:49:55 PM UTC+8, Sergi Pasoev wrote:
> Hi.
> 
> I wonder if it is realistic to get a single key press in Python
> without ncurses or
> any similar library. In single key press I mean something like j and k
> in Gnu less
> program, you press the key and and it is captured by the script without need to
> press enter afterwards

Sounds like the  fast key searching for a list in the DOS application in the  
old days. 

This is easy in GUI of just tens of items, but for thousands of items such 
as in a directory listing, some API is really slow.

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#16703

From88888 Dihedral <dihedral88888@googlemail.com>
Date2011-12-05 22:27 -0800
Message-ID<mailman.3334.1323152877.27778.python-list@python.org>
In reply to#16701
On Tuesday, December 6, 2011 1:49:55 PM UTC+8, Sergi Pasoev wrote:
> Hi.
> 
> I wonder if it is realistic to get a single key press in Python
> without ncurses or
> any similar library. In single key press I mean something like j and k
> in Gnu less
> program, you press the key and and it is captured by the script without need to
> press enter afterwards

Sounds like the  fast key searching for a list in the DOS application in the  
old days. 

This is easy in GUI of just tens of items, but for thousands of items such 
as in a directory listing, some API is really slow.

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#16708

Fromalex23 <wuwei23@gmail.com>
Date2011-12-06 00:39 -0800
Message-ID<90d8ede3-f42e-4342-91cf-cb671cd1b63b@c13g2000vbh.googlegroups.com>
In reply to#16701
On Dec 6, 3:49 pm, Sergi Pasoev <s.pas...@gmail.com> wrote:
> I wonder if it is realistic to get a single key press in Python
> without ncurses or any similar library.

It's possible using Tkinter in the standard library:

http://www.daniweb.com/software-development/python/code/216830

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#16709

FromSteven D'Aprano <steve+comp.lang.python@pearwood.info>
Date2011-12-06 08:48 +0000
Message-ID<4eddd6e7$0$11114$c3e8da3@news.astraweb.com>
In reply to#16701
On Tue, 06 Dec 2011 10:19:55 +0430, Sergi Pasoev wrote:

> Hi.
> 
> I wonder if it is realistic to get a single key press in Python without
> ncurses or
> any similar library. In single key press I mean something like j and k
> in Gnu less
> program, you press the key and and it is captured by the script without
> need to press enter afterwards


Coincidentally, I was working on that exact function last night, so you 
inspired me to put it up on the Python cookbook. This version should work 
on any POSIX system such as Linux, as well as Windows. I don't know if it 
will work on Macintosh.

http://code.activestate.com/recipes/577977-get-single-keypress/



-- 
Steven

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#16713

FromHans Mulder <hansmu@xs4all.nl>
Date2011-12-06 10:28 +0100
Message-ID<4edde040$0$6973$e4fe514c@news2.news.xs4all.nl>
In reply to#16709
On 6/12/11 09:48:39, Steven D'Aprano wrote:
> On Tue, 06 Dec 2011 10:19:55 +0430, Sergi Pasoev wrote:
>
>> Hi.
>>
>> I wonder if it is realistic to get a single key press in Python without
>> ncurses or
>> any similar library. In single key press I mean something like j and k
>> in Gnu less
>> program, you press the key and and it is captured by the script without
>> need to press enter afterwards
>
>
> Coincidentally, I was working on that exact function last night, so you
> inspired me to put it up on the Python cookbook. This version should work
> on any POSIX system such as Linux, as well as Windows. I don't know if it
> will work on Macintosh.
>
> http://code.activestate.com/recipes/577977-get-single-keypress/

It works fine on MacOS/X, but probably not on MacOS Classic.

-- HansM

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#16714

FromNobody <nobody@nowhere.com>
Date2011-12-06 09:48 +0000
Message-ID<pan.2011.12.06.09.49.07.611000@nowhere.com>
In reply to#16701
On Tue, 06 Dec 2011 10:19:55 +0430, Sergi Pasoev wrote:

> I wonder if it is realistic to get a single key press in Python
> without ncurses or any similar library.

On Unix, you need to use termios.tcsetattr() to disable "canonical mode".
Otherwise, the tty driver will only pass data up to the application when
the user enters a newline or EOF.

If you do this, you also need to handle SIGTSTP and SIGCONT, restoring the
original terminal settings on SIGTSTP (typically generated by Ctrl-Z) and
restoring the application's setting on SIGCONT.

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#16736

FromGrant Edwards <invalid@invalid.invalid>
Date2011-12-06 15:22 +0000
Message-ID<jblbv9$sl8$1@reader1.panix.com>
In reply to#16701
On 2011-12-06, Sergi Pasoev <s.pasoev@gmail.com> wrote:

> I wonder if it is realistic to get a single key press in Python
> without ncurses or
> any similar library.

Yes.  Just put the tty associated with stdin in raw mode and make
single byte read() calls on it. Remember to restore the tty settings
when your program exits.

-- 
Grant Edwards               grant.b.edwards        Yow! World War III?
                                  at               No thanks!
                              gmail.com

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#16738

From88888 Dihedral <dihedral88888@googlemail.com>
Date2011-12-06 07:38 -0800
Message-ID<29192698.206.1323185896052.JavaMail.geo-discussion-forums@prfs25>
In reply to#16736
On Tuesday, December 6, 2011 11:22:18 PM UTC+8, Grant Edwards wrote:
> On 2011-12-06, Sergi Pasoev <s.pa...@gmail.com> wrote:
> 
> > I wonder if it is realistic to get a single key press in Python
> > without ncurses or
> > any similar library.
> 
> Yes.  Just put the tty associated with stdin in raw mode and make
> single byte read() calls on it. Remember to restore the tty settings
> when your program exits.
> 
> -- 
> Grant Edwards               grant.b.edwards        Yow! World War III?
>                                   at               No thanks!
>                               gmail.com

Cheers to virus scan software that has to scan fast and easily for all files
under a drive. Easy clean up in APPS.

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