Redirect an output command to a variable or file?

问题

I'm trying to write a python script that will allow me to take the output from a command and to put that into a file or variable (Preferability a variable).

In my code, I have redirected the output to a StringIO() object. From that, I want take the output a command and to put it into that StringIO() object.

Here is a sample of my code:

from StringIO import StringIO
import sys

old_stdout = sys.stdout

result = StringIO()
sys.stdout = result

# This will output to the screen, and not to the variable
# I want this to output to the 'result' variable
os.system('ls -l')

Also, how do I take result and put it into a string?

Thanks in advance!!

回答1:

import subprocess
sp = subprocess.Popen(['ls', '-l'], stdout=subprocess.PIPE)
output, _ = sp.communicate()
print "Status:", sp.wait()
print "Output:"
print output

来源：https://stackoverflow.com/questions/13476590/redirect-an-output-command-to-a-variable-or-file