Path: csiph.com!goblin2!goblin.stu.neva.ru!newsfeed.xs4all.nl!newsfeed8.news.xs4all.nl!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Pipes
Date: Sun, 09 Aug 2015 14:17:57 -0400
Organization: IISS Elusive Unicorn
References: <d6a3dfe4-8389-463b-ac66-a93f14a91a5e@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.13.1439144297.3627.python-list@python.org>
Lines: 147
NNTP-Posting-Host: 2001:888:2000:d::a6
Xref: csiph.com comp.lang.python:95199

On Sun, 9 Aug 2015 07:10:50 -0700 (PDT), rogerh906@gmail.com declaimed the
following:

>Just learning Python and have a question.
>
>Is it possible for Python to pass information to another program (in Windows), wait for that program to finish and then resume operating?
>
>It's called a pipe in Unix systems.
>

	They are called pipes in Windows too... IF you mean the chaining of one
process's stdout to another process's stdin -- and this feature is handled
by the OS, not Python.

-=-=-=-=- generator.py
import random
import sys

for i in xrange(100):   #yes, it's Python 2.7!
    sys.stdout.write("%s\n" %
                     (random.randint(1, 6)
                     + random.randint(1, 6)) )

-=-=-=-=- eater.py
import sys

while True:
    ln = sys.stdin.readline()
    if not ln: break
    v = int(ln.strip())
    if v == 2:
        v = "snake-eyes"
    elif v == 12:
        v = "boxcars"
    print "You rolled %s" % v

-=-=-=-=- console
C:\Users\Wulfraed\Documents\Python Progs>generator | eater
You rolled 6
You rolled 11
You rolled 6
You rolled 5
You rolled 11
You rolled 4
You rolled 4
You rolled 7
You rolled 3
You rolled boxcars
You rolled 9
You rolled 8
You rolled 6
You rolled 7
You rolled 9
You rolled 7
You rolled 3
You rolled 8
You rolled 3
You rolled snake-eyes
You rolled 6
You rolled 9
You rolled snake-eyes
You rolled 7
You rolled 7
You rolled 7
You rolled 10
You rolled 7
You rolled 7
You rolled 7
You rolled 6
You rolled 3
You rolled 9
You rolled 4
You rolled 11
You rolled 6
You rolled 8
You rolled 7
You rolled 6
You rolled 10
You rolled 6
You rolled 8
You rolled 6
You rolled 9
You rolled 6
You rolled boxcars
You rolled 8
You rolled 9
You rolled 9
You rolled 4
You rolled 7
You rolled 5
You rolled 8
You rolled 5
You rolled 11
You rolled 7
You rolled snake-eyes
You rolled 8
You rolled snake-eyes
You rolled 6
You rolled 9
You rolled 6
You rolled 6
You rolled 6
You rolled 10
You rolled 7
You rolled 6
You rolled 8
You rolled 7
You rolled 6
You rolled 6
You rolled 9
You rolled 5
You rolled 5
You rolled 4
You rolled 6
You rolled 4
You rolled 8
You rolled 8
You rolled snake-eyes
You rolled 7
You rolled 5
You rolled 4
You rolled 7
You rolled 6
You rolled 7
You rolled 8
You rolled 8
You rolled 10
You rolled 9
You rolled 5
You rolled 10
You rolled 6
You rolled 8
You rolled 3
You rolled 5
You rolled 5
You rolled 4
You rolled 9
You rolled 8

C:\Users\Wulfraed\Documents\Python Progs>

	If you mean something more complex, then I suggest you read the library
manual -- in particular, look for the module "subprocess"
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/