Copy Stdout to string

Gerard Flanagan grflanagan at
Tue Apr 1 16:36:07 CEST 2008

On Apr 1, 4:03 pm, sophie_newbie <paulgeele... at> wrote:
> Hi, I'm wondering if its possible to copy all of stdout's output to a
> string, while still being able to print on screen. I know you can
> capture stdout, but I still need the output to appear on the screen
> also...
> Thanks!

I don't know if it's what you want, but if you're talking about the
output of a single command, then the following (or a variation) should
do. (using 'svn info' as the command).

import subprocess
from cStringIO import StringIO
import sys

buf = StringIO()

def popen(cmdline):
    return subprocess.Popen(cmdline,

for line in popen('svn info'):
    print >> sys.stdout, 'out: ' + line,
    print >> buf, 'buf: ' + line,


print buf.getvalue()

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