In Python 3 how can I patch a function inside a module for unit testing?

I have decorated methods that send timings to a hosted graphite instance they look like what is below

views.py

from util import send_timing

@send_timing('login')
def login_user():

    if is_user_ok():
        return True
    return False

@send_timing('get_user_info')
def get_user_info():

    return get_that_info()

I have a util file that defines the decorator

util.py

def send_timing(f):
  def decorated(*args):
     make_network_connection()
     ret = f(*args)
  return decorated

I have some unit tests

test.py

from views import *
import unittest

class TestCase(unittest.TestCase):

   def test_login(self):         
      self.assertTrue(login_user())

Now the problem is that call to login_user. It invokes the send_timing decorator which in turn makes a network connection. This makes my tests volatile and non-deterministic. Is there an easy way (python 3.3) to patch send_timing with a dummy or mock globally for all my tests?