Op 22-08-13 07:51, Ian Simcock schreef:
> Greetings all.
>
> I'm using Python 2.7 under Windows and am trying to run a command line
> program and process the programs output as it is running. A number of
> web searches have indicated that the following code would work.
>
> import subprocess
>
> p = subprocess.Popen("D:\Python\Python27\Scripts\pip.exe list -o",
> stdout=subprocess.PIPE,
> stderr=subprocess.STDOUT,
> bufsize=1,
> universal_newlines=True,
> shell=False)
> for line in p.stdout:
> print line
>
> When I use this code I can see that the Popen works, any code between
> the Popen and the for will run straight away, but as soon as it gets to
> the for and tries to read p.stdout the code blocks until the command
> line program completes, then all of the lines are returned.
>
> Does anyone know how to get the results of the program without it blocking?
Maybe the following can work?
Untested code:
from pty import openpty
from subprocess import Popen
master, slave = openpty()
p = Popen("D:\Python\Python27\Scripts\pip.exe list -o",
stdout = slave,
stderr = slave,
stdin = slave,
close_fds = True)
for line in master:
print line
The idea is to set a a pseudo terminal for pip so that the
system thinks pip is doing IO with a terminal and so the
IO will be line buffered. But all IO from pip will be available
through the master in your program.
--
Antoon Pardon
--
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