多线程获取返回值

有这样一个代码：

import threading

def aa(data):
    return data

for i in range(5):
    threading.Thread(target=aa, args=(i,)).start()

获取返回值：

import threading
import time

class Response:
  responses = {}

  def add_th(self, name, data):
    self.responses[name] = data

def aa(name):
  now = time.time()
  response.add_th(name, now)


response = Response()

if __name__ == '__main__':
    for i in range(5):
      threading.Thread(target=aa, args=(i,)).start()

    time.sleep(1)
    print(response.responses)

运行结果：