项目完成后，运行出错，实在不知道哪里出错了
E:\python\ppt12\12.2>python tornado_server.py
Traceback (most recent call last):
File “tornado_server.py”, line 15, in
sys.exit( main() )
File “tornado_server.py”, line 9, in main
http_server.listen( 5000 )
File “C:\Users\Administrator\AppData\Local\Programs\Python\Python38\lib\site-packages\tornado\tcpserver.py”, line 152, in listen
self.add_sockets(sockets)
File “C:\Users\Administrator\AppData\Local\Programs\Python\Python38\lib\site-packages\tornado\tcpserver.py”, line 165, in add_sockets
self._handlers[sock.fileno()] = add_accept_handler(
File “C:\Users\Administrator\AppData\Local\Programs\Python\Python38\lib\site-packages\tornado\netutil.py”, line 279, in add_accept_handler
io_loop.add_handler(sock, accept_handler, IOLoop.READ)
File “C:\Users\Administrator\AppData\Local\Programs\Python\Python38\lib\site-packages\tornado\platform\asyncio.py”, line 99, in add_handler
self.asyncio_loop.add_reader(fd, self._handle_events, fd, IOLoop.READ)
File “C:\Users\Administrator\AppData\Local\Programs\Python\Python38\lib\asyncio\events.py”, line 501, in add_reader
raise NotImplementedError
NotImplementedError

但是运行 python manager.py runserver 是正确的