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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def listen(self, port: int, address: str = "") -> None: """Starts accepting connections on the given port. This method may be called more than once to listen on multiple ports. `listen` takes effect immediately; it is not necessary to call `TCPServer.start` afterwards. It is, however, necessary to start the `.IOLoop`. """

        sockets = bind_sockets(port, address=address)
        self.add_sockets(sockets)