一.问题描述：
joes@joes:~/jiao/Project/demo01_ws$ rosrun helloworld helloworld_p.py
[INFO] [1636100465.680519]: Hello World by python_____from Jiaozhidong
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/core.py", line 513, in _ros_atexit
signal_shutdown('atexit')
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/core.py", line 496, in signal_shutdown
if t.isAlive():
AttributeError: 'Thread' object has no attribute 'isAlive'
二.解决方法：
1.sudo gedit /opt/ros/kinetic/lib/python2.7/dist-packages/rospy/core.py
（依据自己的报警路径进行修正。）
2.搜索报警提示的 t.isAlive()
3.将t.isAlive() 改为 t.is_alive()
原因：python3对于isAlive函数不再支持，需要更新为is_alive格式。
参考：
add-apt-repository命令AttributeError: ‘Thread‘ object has no attribute ‘isAlive‘的解决方案_Y18758381593的博客-CSDN博客
