python 多进程

python虚假的多线程在计算量大的程序中很折磨，真正的多进程需要考虑数据同步问题。这里讨论一下如何同步类的实例，并调用类里的方法。调用类的方法时，应该

import multiprocessing
import random
from multiprocessing.managers import BaseManager
import anytree
import time
class MyTree(anytree.Node):
    def __init__(self, name, **kwargs):
        super().__init__(name, **kwargs)
        self.num = 0
    def add_one(self):
        self.num += 1
        a = 2**3 + 98**83/12
        time.sleep(random.random())
def add_one(t: MyTree):
    t.add_one()
if __name__ == '__main__':
    manager = BaseManager()
    manager.register('MyTree', MyTree)
    manager.start()
    t = manager.MyTree('a')
    print(t)
    l = []
    for i in range(200):
        p = multiprocessing.Process(target=add_one, args=(t, ))
        l.append(p)
        p.start()
    for p in l:
        print('remaining: ', len(multiprocessing.active_children()))
        p.join()
    print(t)