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Newsgroups: comp.lang.python
Date: Sun, 23 Sep 2012 08:49:44 -0700 (PDT)
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Subject: Re: Seome kind of unblocking input
From: Ramchandra Apte <maniandram01@gmail.com>
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On Saturday, 22 September 2012 01:24:46 UTC+5:30, Dennis Lee Bieber  wrote:
> On Fri, 21 Sep 2012 02:13:28 -0700 (PDT), janis.judvaitis@gmail.com
>=20
> declaimed the following in gmane.comp.python.general:
>=20
>=20
>=20
> > Since I'm using threads and pipes everything works ok, except that when=
 i call input() there is no way that I could print something, is there any =
workaround for this??
>=20
> >=20
>=20
> > Note: I don't need to catch any key's before enter or smtng, just be ab=
le to print while input() is waiting. I'm thinking that maybe there is a wa=
y for two threads to share one stdout, which should resolve this, but I can=
't make it work, since U can't pickle file like object(stdout) to pass it t=
o other thread.
>=20
> >
>=20
>=20
>=20
> 	Confusion abounds...
>=20
>=20
>=20
> 	You don't have to "pickle file like object..." for it to be used by
>=20
> a Python THREAD... But your mention of pipes makes me think you are
>=20
> using subprocesses and/or multiprocessing modules. Threads run in a
>=20
> shared environment (you may need to put a lock around the file object so
>=20
> that only one thread at a time does the I/O on that object), but
>=20
> processes are independent memory spaces.
>=20
>=20
>=20
> 	However, you may also encounter OS specific behavior WRT
>=20
> stdout/stderr when they are connected to a console. The OS itself may
>=20
> block/buffer output when there is a pending input on the same console.
>=20
> --=20
>=20
> 	Wulfraed                 Dennis Lee Bieber         AF6VN
>=20
>         wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

You can clear the buffer by calling file.flush()