[issue29609] Receiving messages from subprocess does not work on Mac OS X

2017-02-20 Thread pyguy 

New submission from pyguy:

When I use the subprocess module to run a another process, I expect to be able 
to read the STDOUT and STDERR of the other process. This is not possible on Mac 
OS X. The attached test program has been tested on Linux and Windows and does 
work as expected. It pauses at the process.stdout.readline() line of code every 
time on Mac OS X.

--
components: macOS
files: testwrapper.py
messages: 288250
nosy: ned.deily, pyguy, ronaldoussoren
priority: normal
severity: normal
status: open
title: Receiving messages from subprocess does not work on Mac OS X
type: behavior
versions: Python 2.7, Python 3.5
Added file: http://bugs.python.org/file46656/testwrapper.py

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[issue29609] Receiving messages from subprocess does not work on Mac OS X

2017-02-20 Thread pyguy 

pyguy added the comment:

The program failed for me on Mac OS 10.4.11 using Python 2.7.12 and Mac OS 
10.6.8 using Python 2.7.13.

--
status: pending -> open

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[issue29609] Receiving messages from subprocess does not work on Mac OS X

2017-02-20 Thread pyguy 

pyguy added the comment:

Using communicate fixed the problem. Here is the program that works for me on 
Mac OS 10.4.11 with Python 2.7.12:

import subprocess
import time

print("Launch started")
program_name = "top"
list = [program_name]
process = subprocess.Popen(list)
while process.poll() == None:
print("subprocess still running")
print("Value = " + process.communicate())
time.sleep(0.1)

print("Exit")



Thank you Ned.

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resolution: works for me -> fixed

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[issue29609] Receiving messages from subprocess does not work on Mac OS X

2017-02-20 Thread pyguy 

pyguy added the comment:

The program does not work the way I wanted it to. I want the output of the top 
command to be seen only by the python program. The program I made causes the 
top command to print its output to the terminal. Using subprocess.Popen() with 
stdout=subprocess.PIPE does prevent the top command's output from being printed 
to the terminal. Now I need a way to actually work with that output. Would you 
know a way to do this?

I can't use the communicate() function because it blocks until the top command 
quits.

--
resolution: not a bug -> works for me
status: closed -> open

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