python pool

 1 from multiprocessing import Pool
 2 import os
 3 def f(x):
 4     print "Os is%s"%os.getpid()
 5     return x*x
 6 if __name__ == ‘__main__‘:
 7     pool = Pool(processes=4)
 8     result = pool.apply_async(f,[10])
 9     print result.get(timeout=10)
10     print pool.map(f,range(10))

 1 Os is7288
 2 100
 3 Os is7288
 4 Os is7288
 5 Os is7288
 6 Os is7288
 7 Os is7288
 8 Os is7288
 9 Os is7288
10 Os is7288
11 Os is7288
12 Os is7288
13 [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]