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1. Multiprocessing in Python

   #!/bin/env python
   
   from multiprocessing import Pool
   import time
   
   PARALLEL = 1
   
   def f(x):
       print "start sleeping"
       time.sleep(1)
       print "end sleeping"
       return x
   
   if __name__ == '__main__':
   
       l = xrange(15)
   
       if PARALLEL:
           pool = Pool()
           l2 = pool.map(f, l)
           pool.close()
           pool.join()
       else:
           l2 = map(f, l)
   
       print l2