This code is runnable

I get an empty array “link”

although I should get an array with objects in it,
when I print link in func_b it is not empty

Self should refer to the object, but I guess this is not the case with multiprocessing, it seems to be some kind of copy

Does anyone know a solution ?

THX

class class_b:
     
     def __init__(self):
          
        self.counter=0
        self.sum=[]

class class_a:

    import random as ran
    from multiprocessing import Pool
    import os

    def __init__(self):

        self.link=[0]*50
        self.arr_a=[0]*100

    def func_b(self,arg):
        
        arr_key=self.ran.randint(0, 50)

        if self.link[arr_key] ==0:

            self.link[arr_key]=class_b()

        else:

            obj=self.link[arr_key]
            obj.counter+=1
            (obj.sum).append(self.ran.randint(0,10))
        
        print(self.link)

        

    def func_a(self):
        
        with self.Pool(processes=self.os.cpu_count()) as pool:

                pool.map(self.func_b,enumerate(self.arr_a))

        print(self.link)

def task():

    obj=class_a()
    obj.func_a()

if __name__ == '__main__':
    task()