Python Subprocess module
samper.d at gmail.com
Fri Jul 13 23:15:49 CEST 2007
A simple question hopefully. despite all my searching I have not found a
The goal. Interact with a command line program. Simple enough, but the
key is INTERACT.
I tried the shell and comand approaches but that initiates, it does not
allow interaction with the programs.
So then I went with Popen and such... which then led to the subprocess
I can create the object and read a few lines of output. but if I go too
far then the program hangs. the number of lines will differ depandening
on many function including the format of an input file so I can;t
hardcode how many lines to read.
I want to read all of STDOUT without failing because I went out of range.
next I want to read the final line of the output because it tells me
what is required for the next line of input.
I am supposed to be able to entre 'y' and return for the program to
continue if I agree with what I see in the stdout.
A problem exists though that I have tried
and nothing seems to get the program going again for I still cant; read
past the same point in the standard output. then I have to kill and
So the next approach included looking at Pexpect, which got realy
confusing realy fast and despite running fedora core and python 2.4.4 I
would like my application to be cross platform and there is no Pexpect
for Windows That I can see.
I have checked out many mailing lists and posts and tutorials but they
all admit to not be samples of complex interactivity. I guess I am
having that special case.
ASPN Python cookbok provided some code for a new Popen Class that allows
for interaction but I don't think I need to go that root....
I am essentialy trying to build and Python wrapper for a coomand line
program that i want to build a GUI around.
Any links or suggestions would be great. Unfortunaetly I don't
understand that abstract concepts in the manual reference. I am fresh in
the python world and find examples better than technical abstracts.
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