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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 send(self, message):
 """ Sends a message to all subscribers of destination. @param message: The message frame. (The frame will be modified to set command to MESSAGE and set a message id.) @type message: L{stompclient.frame.Frame} """

        dest = message.headers.get('destination')
        if not dest:
            raise ValueError(
                "Cannot send frame with no destination: %s" % message)

        message.cmd = 'message'

        message.headers.setdefault('message-id', str(uuid.uuid4()))

        bad_subscribers = set()
        for subscriber in self._topics[dest]:
            try:
                subscriber.send_frame(message)
            except:
                self.log.exception(
                    "Error delivering message to subscriber %s; client will be disconnected." % subscriber)
                # We queue for deletion so we are not modifying the topics dict
                # while iterating over it.
                bad_subscribers.add(subscriber)

        for subscriber in bad_subscribers:
            self.disconnect(subscriber)