Is there a way to poll a file handle returned from subprocess.Popen?

Question

Say I write this:

from subprocessing import Popen, STDOUT, PIPE
p = Popen([\"myproc\"], stderr=STDOUT, stdout=PIPE)

Now if I do

Answer 1

Use the select module in Python's standard library, see http://docs.python.org/library/select.html . select.select([p.stdout.fileno()], [], [], 0) immediately returns a tuple whose items are three lists: the first one is going to be non-empty if there's something to read on that file descriptor.