我先几个笔记给自己看

import os
from multiprocessing import Process, Manager

def task1(a,b,return_dict=None):    
    print('task1')    
    if return_dict is not None:
        return_dict['task1'] = a+b
    return a+b

def task2(c,return_dict=None):    
    print('task2')
    if return_dict is not None:
        return_dict['task2'] = c*c
    return c*c


if __name__ == "__main__":

    return_dict = Manager().dict()
    t1 = Process(target=task1, args=(1, 2, return_dict))
    t2 = Process(target=task2, args=(4, return_dict))
    
    t1.start()
    t2.start()

    t1.join()
    t2.join()
    
    print(return_dict['task1'],return_dict['task2'])