Merging a Python script's subprocess' stdout and stderr while keeping them distinguishable

Question

I would like to direct a python script\'s subprocess\' stdout and stdin into the same file. What I don\'t know is how to make the lines from the two sources distinguishable?

Answer 1

You may write the stdout/err to a file after the command execution. In the example below I use pickling so I am sure I will be able to read without any particular parsing to differentiate between the stdout/err and at some point I could dumo the exitcode and the command itself.

import subprocess
import cPickle

command = 'ls -altrh'
outfile = 'log.errout'
pipe = subprocess.Popen(command, stdout = subprocess.PIPE,
                        stderr = subprocess.PIPE, shell = True)
stdout, stderr = pipe.communicate()

f = open(outfile, 'w')
cPickle.dump({'out': stdout, 'err': stderr},f)
f.close()