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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 
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socket.error: [Errno 98] Address already in use This is because the previous execution has left the socket in a TIME_WAIT state, and can’t be immediately reused. There is a socket flag to set, in order to prevent this, socket.SO_REUSEADDR:
Running an example several times with too small delay between executions, could lead to this error: socket.error: [Errno 98] Address already in use. This is because the previous execution has left the socket in a TIME_WAIT state, and can’t be immediately reused. There is a socket flag to set, in order to prevent this, socket.SO_REUSEADDR:
The cleanest way to make the socket immediately reusable is to follow the recommendation to first shutdown the client end ( socket) of a connection, and make sure the server's end shuts down last (through exception handling if needed).
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.
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