[python] python socket.error: [Errno 98] Address already in use

when i setup application.py, it shows that socket.error: [Errno 98] Address already in use.

Traceback (most recent call last):
File "application.py", line 121, in <module>
main()
File "application.py", line 117, in main
http_server.listen(options.port)
File "/usr/local/lib/python2.7/site-packages/tornado-3.1-py2.7.egg/tornado/tcpserver.py", line 117, in listen
sockets = bind_sockets(port, address=address)
File "/usr/local/lib/python2.7/site-packages/tornado-3.1-py2.7.egg/tornado/netutil.py", line 90, in bind_sockets
sock.bind(sockaddr)
File "/usr/local/lib/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
socket.error: [Errno 98] Address already in use

There is obviously another process listening on the port. You might find out that process by using the following command:

$ lsof -i :8000

or change your tornado app's port. tornado's error info not Explicitly on this.