close_fds supported on Windows (look for "close_fds" after this link) starting with Python 2.6 (ifstdin/stdout/ arestderrnot redirected). You may consider updating.
UPDATE 2017-11-16 after the vote (why?) : From a related document:
Note that on Windows you cannot set close_fds to true, nor can you redirect standard descriptors by setting stdin, stdout or stderr.
So you can subprocess.callto close_fds = Truenot install stdin, stdoutor stderr(default) (or set them on None):
subprocess.call(command, shell=True, close_fds = True)
or subprocess.callwith close_fds = False:
subprocess.call(command, shell=True, stderr=errptr, stdout=outptr, close_fds = False)
(Python >= 3.2), subprocess.call close_fds :
subprocess.call(command, shell=True, stderr=errptr, stdout=outptr)