Collecting Stderr In Memory With Subprocess.call

I'm trying to collect stderr in memory, instead of directly writing it to a file or stdout. I do this so I can generated the error log file in a certain way. I found a library call

Solution 1:

stdout = subprocess.check_output(args)

See check_output documentation for more options.

If you don't want to capture stdout, use Popen.communicate:

from subprocess import Popen, PIPE

p = Popen(args, stdout=log_fps["trace"], stderr=PIPE)
_, stderr = p.communicate()

Solution 2:

import subprocess

p = subprocess.Popen(args, stdout=log_fps["trace"], stderr=subprocess.PIPE)

_, stderr = p.communicate()
printstderr,