def queue_delete(self, queue='',
                     if_unused=False, if_empty=False, nowait=False):
        """Delete a queue

        This method deletes a queue.  When a queue is deleted any
        pending messages are sent to a dead-letter queue if this is
        defined in the server configuration, and all consumers on the
        queue are cancelled.

        RULE:

            The server SHOULD use a dead-letter queue to hold messages
            that were pending on a deleted queue, and MAY provide
            facilities for a system administrator to move these
            messages back to an active queue.

        PARAMETERS:
            queue: shortstr

                Specifies the name of the queue to delete. If the
                queue name is empty, refers to the current queue for
                the channel, which is the last declared queue.

                RULE:

                    If the client did not previously declare a queue,
                    and the queue name in this method is empty, the
                    server MUST raise a connection exception with
                    reply code 530 (not allowed).

                RULE:

                    The queue must exist. Attempting to delete a non-
                    existing queue causes a channel exception.

            if_unused: boolean

                delete only if unused

                If set, the server will only delete the queue if it
                has no consumers. If the queue has consumers the
                server does does not delete it but raises a channel
                exception instead.

                RULE:

                    The server MUST respect the if-unused flag when
                    deleting a queue.

            if_empty: boolean

                delete only if empty

                If set, the server will only delete the queue if it
                has no messages. If the queue is not empty the server
                raises a channel exception.

            nowait: boolean

                do not send a reply method

                If set, the server will not respond to the method. The
                client should not wait for a reply method.  If the
                server could not complete the method it will raise a
                channel or connection exception.

        """
        args = AMQPWriter()
        args.write_short(0)
        args.write_shortstr(queue)
        args.write_bit(if_unused)
        args.write_bit(if_empty)
        args.write_bit(nowait)
        self._send_method((50, 40), args)

        if not nowait:
            return self.wait(allowed_methods=[
                (50, 41),  # Channel.queue_delete_ok
            ])
Delete a queue

        This method deletes a queue.  When a queue is deleted any
        pending messages are sent to a dead-letter queue if this is
        defined in the server configuration, and all consumers on the
        queue are cancelled.

        RULE:

            The server SHOULD use a dead-letter queue to hold messages
            that were pending on a deleted queue, and MAY provide
            facilities for a system administrator to move these
            messages back to an active queue.

        PARAMETERS:
            queue: shortstr

                Specifies the name of the queue to delete. If the
                queue name is empty, refers to the current queue for
                the channel, which is the last declared queue.

                RULE:

                    If the client did not previously declare a queue,
                    and the queue name in this method is empty, the
                    server MUST raise a connection exception with
                    reply code 530 (not allowed).

                RULE:

                    The queue must exist. Attempting to delete a non-
                    existing queue causes a channel exception.

            if_unused: boolean

                delete only if unused

                If set, the server will only delete the queue if it
                has no consumers. If the queue has consumers the
                server does does not delete it but raises a channel
                exception instead.

                RULE:

                    The server MUST respect the if-unused flag when
                    deleting a queue.

            if_empty: boolean

                delete only if empty

                If set, the server will only delete the queue if it
                has no messages. If the queue is not empty the server
                raises a channel exception.

            nowait: boolean

                do not send a reply method

                If set, the server will not respond to the method. The
                client should not wait for a reply method.  If the
                server could not complete the method it will raise a
                channel or connection exception.