I want to know how to run a progress bar and some other work simultaneously, then when the work is done, stop the progress bar in Python (2.7.x)

import sys, time
def progress_bar():
 while True:
  for c in ['-','\\','|','/']:
   sys.stdout.write('\r' + "Working " + c)
   sys.stdout.flush()
   time.sleep(0.2)

def work():
 *doing hard work*

How would I be able to do something like:

progress_bar() #run in background?
work()
*stop progress bar*
print "\nThe work is done!"