Как поставить timeout в subprocess? Или как прекратить выполнение?

/...'vk.com'],timeout=n

>>> import socket
>>> socket.create_connection(('vk.com', 80), 1)
<socket._socketobject object at 0xb70c64c4>
>>> socket.create_connection(('vk.com', 80), 0.1)
<socket._socketobject object at 0xb70d8b1c>
>>> socket.create_connection(('vk.com', 80), 0.0001)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/socket.py", line 575, in create_connection
    raise err
socket.error: [Errno 101] Network is unreachable

  
import subprocess32 as subprocess  
p = subprocess.Popen(["env"],  stderr=subprocess.PIPE, stdout=subprocess.PIPE, env = os.environ)
stdoutdata = "timer timeout"
timer = Timer(timeout_sec, p.kill, [] )
timer.start()
stdoutdata,stderrdata = p.communicate()
timer.cancel()