【Python】python获取线程的返回值的方法

from threading import Thread
import random
import time
class MyThread(Thread):
    # 继承Thread类
    def __init__(self,group=None, target=None, name=None, args=(), kwargs=None, *, daemin=None):
        Thread.__init__(group, target, name, args, kwargs, daemin=None)
        self._return_value = None
    
    def run(self):
        # 重新定义Thread类里的run方法
        try:
            if self._target:
                self._return_value = self._target(*args, **kwargs)        # 把原来的self._target方法返回值赋给self._return_value
        finally:
            del self._target, self._args, self._kwargs
            
    def join(self, timeout=None):
        # 重新定义join方法，等待线程执行完成，返回值
        Thread.join(self, timeout)            # 调用原类的join方法，原方法中调用Thread类外方法，所以不能直接重写。
        return self._return_value             # 返回self._return_value,在类外，使用join获取值。
        
        
        
class ReturnValue(object):
    # 调用自定义的thread类，获取返回值。
    def __init__(self):
        self.result = None
        
    def run(self):
        thread_list = []
        thread_result = {}
        for i in range(10)
            mythread = MyThread(target=self.show, args=(i,))
            thread_list.append(mythread)
            mythread.start()
            
        for t in thread_list:
            self.result = t.join()
            thread_result[t] = self.result
            thread_list.remove(t)
        for k, v thread_result.items():
            print(k,v)
            
            
    def show(self,i):
        rand = random.randint(2,7)    
        time.sleep(rand)
        return "args:{},rand_value:{}".format(i,rand)

        
return_value = ReturnValue()
return_value.run()