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+--- Thread: How to read stderr=PIPE in real time? (/showthread.php?tid=94028)
How to read stderr=PIPE in real time? - Popeye - 2011-02-13
I'm writing a add-on for displaying status of downloads. The downloads are executed in a python script keeping queue data in a sqlite data base. My problem is the actual download are done by binary writing its status on stderr and it takes minutes / hours to finish.
Code:
dmp = subprocess.Popen(args, bufsize=-1, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
while True:
if dmp.poll() is not None:
break
while True:
line = dmp.stderr.readline()
if not line:
break
print line.rstrip()
time.sleep(5)
print "Dumping done!"Code:
dmp = subprocess.Popen(args, bufsize=-1, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
while True:
if dmp.poll() is not None:
break
(stdout, stderr) = dmp.communicate()
print "out: " + stdout + " error: " + stderr
time.sleep(5)
print "Dumping done!"I could of course write stderr to a file and read from this but if I could avoid it it would be nice/cleaner
I've googled for hours and read a good amount of similar problems on stackoverflow but not got any clear answers. Any of you skilled coders got any suggestions on how to proced?
- bobo1on1 - 2011-02-13
In C you would get the file descriptor from the FILE*, then do either a non blocking read on that, or use select() with a timeout.
I'm not sure if python exposes such functionality.
Maybe you can just call the C functions from python instead.