问OSError [Errno 99] - python

EN

import socket

s = socket.socket()         # Create a socket object
host = socket.gethostname() # Get local machine name
port = 22331                # Reserve a port
s.bind((host, port))        # Bind to the port

s.listen(5)                 # Now wait for client connection.
while True:
   c, addr = s.accept()     # Establish connection with client.
   print('Got connection from', addr)
   c.send('Thank you for connecting')
   c.close() 

OSError: [Errno 99] Cannot assign requested address