获取多进程函数返回值

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from multiprocessing import Process
from multiprocessing import Manager
def a(x):
    b=1+2
    x[b]=b
if __name__=='__main__':
    manager = Manager()
    x = manager.dict()
    p1 = Process(target=a,args=(x,))
    p1.start()
    p1.join()
    print(x.values())