Saving stdout from subprocess.Popen to file, plus writing more stuff to the file

Question

I\'m writing a python script that uses subprocess.Popen to execute two programs (from compiled C code) which each produce stdout. The script gets that output and saves it to

Answer 1

You could call .wait() on each Popen object in order to be sure that it's finished and then call log.flush(). Maybe something like this:

def run(cmd, logfile):
    p = subprocess.Popen(cmd, shell=True, universal_newlines=True, stdout=logfile)
    ret_code = p.wait()
    logfile.flush()
    return ret_code

If you need to interact with the Popen object in your outer function you could move the .wait() call to there instead.