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? (For example prefix the lines from stderr with an exclamation mark.)
In my particular case there is no need for live monitoring of the subprocess, the executing Python script can wait for the end of its execution.
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()