import threading
import time

# 向线程发送信息的辅助类
class StopThread:
  def __init__(self):
    self.go = True

# 线程类
class ThreadGo(threading.Thread):
  def __init__(self, name="", *args, **kargs):
    threading.Thread.__init__(self) # 执行父类构造函数
    self.args = args
    self.kargs = kargs
    self.name = name

  #重新实现 run 方法
  def run(self):
    while self.kargs["st"].go:
      print("go")
      time.sleep(.5)

st = StopThread()

# 创建线程
th = ThreadGo(st=st)

# 启动线程
th.start()
time.sleep(5)
st.go = False
th.join()
print("exit...")