解决python多线程的返回值问题

import threading
import time
"""重新定义带返回值的线程类"""
class MyThread(threading.Thread):
    def __init__(self,func,args=()):
        super(MyThread,self).__init__()
        self.func = func
        self.args = args
    def run(self):
        self.result = self.func(*self.args)
    def get_result(self):
        try:
            return self.result
        except Exception:
            return None

"""测试函数，计算两个数之和"""
def fun(a,b):
    time.sleep(1)
    return a+b
li = []
for i in range(4):
    t = MyThread(fun,args=(i,i+1))
    li.append(t)
    t.start()
for t in li:
    t.join()  # 一定要join，不然主线程比子线程跑的快，会拿不到结果
    print (t.get_result())