python通过multiprocessing 实现带回调函数的异步调用的代码

下边代码段是关于python通过multiprocessing 实现带回调函数的异步调用的代码。

from multiprocessing import Pool

def f(x):

if __name__ == '__main__':
    pool = Pool(processes=1)              # Start a worker processes.
    result = pool.apply_async(f, [10], callback) # Evaluate "f(10)" asynchronously calling callback when finished.