这里有一个例子来说明这一点，
from multiprocessing import Pool
from time import sleep
def square(x):
return x * x
def cube(y):
return y * y * y
pool = Pool(processes=20)
result_squares = pool.map_async(f, range(10))
result_cubes = pool.map_async(g, range(10))
结果将是：
>>> print result_squares.get(timeout=1)
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
>>> print result_cubes.get(timeout=1)
[0, 1, 8, 27, 64, 125, 216, 343, 512, 729]
602392714
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