stop python subprocess after n bytes or lines in proc.stdout.read() -


i'd run subprocess in python until subprocess has outputted number of bytes or lines. after point, i'd terminate it. possible subprocess?

here's have far:

proc = subprocess.popen(cmd, stdout=subprocess.pipe, stdin=subprocess.pipe, stderr=subprocess.pipe, shell=true) #kill after reaching n bytes of output, proc.terminate() out, errors = proc.communicate()

thanks!

one straightforward way redirect output program byte/line counting you, example:

proc = subprocess.popen(cmd, stdout=subprocess.pipe, stdin=subprocess.pipe, stderr=subprocess.stdout, shell=true) head = subprocess.popen(['head', '-n', '20'], stdin=proc.stdout, stdout=subprocess.pipe, stderr=subprocess.pipe) proc.stdout.close() out, errors = head.communicate()

i'm not sure how portable method is, able test on linux on windows should able use more command similar behavior.

closing proc.stdout necessary proc receives sigpipe when head exits.


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