Looping an executable to get the result from Python script

Question

In my python script, I need to call within a for loop an executable, and waiting for that executable to write the result on the "output.xml".

How do I manage to use wait() & how do I know when one of my executable is finished generating the result to get the result? How do I close that process and open a new one to call again the executable and wait for the new result?

    import subprocess
    args = ("bin/bar")
    popen = subprocess.Popen(args)

I need to wait for the output from "bin/bar" to generate the "output.xml" and from there, read it's content.

    for index, result in enumerate(results):
        myModule.callSubProcess(index)
        #this is where the problem is.
        fileOutput = open("output.xml")
        parseAndStoreInSQLiteFileOutput(index, file)

Answer 1

Popen.wait() will make the script wait until the process ends. There's no need to kill the process afterwards, since it will have already exited.

Answer 2

hello, I think the easiest way to do is using call:

import subprocess
retcode = subprocess.call('command', shell=True)

It waits for the process to terminate and assign the return code to the variable. For more detailed description see 17.1.subprocess - convenience functions in the python documentation. Hope it helps.