from multiprocessing import Process

class Process():
    def start():
        run()
    def join():
        ...
    def run():
        ..

class Test(Process):
    def __init__(self,value):
        self.value = value
        super().__init__()
    def a():
        

    def run(self):
        a()
        b()
        c()
        d()

t = Test(2)
t.start()
t.join()