On 05/09/2012 11:35 AM, Florian Lindner wrote: > Hello, > > how can I achieve a behavior like tee in Python? > > * execute an application > * leave the output to stdout and stderr untouched > * but capture both and save it to a file (resp. file-like object) > > I have this code > > proc = subprocess.Popen(shlex.split(cmd), stdout = subprocess.PIPE, > stderr=subprocess.STDOUT) > while True: > out = proc.stdout.readline() > if out == '' and proc.poll() != None: > break > sys.stdout.write(out) > logfile.write(out) > > This works so far but always buffers a couple of lines and outputs > them en bloc. The final output is like it is desired but with a > significant delay. Is there a way around that? > > Thanks, > > Florian Chances are that other program is buffering its output. Many programs check if they're running on a tty, and turn off buffering for interactive use. But redirect them into a pipe, and they'll run as efficiently as possible, which includes buffering the output.
-- DaveA -- http://mail.python.org/mailman/listinfo/python-list
