human
Complete the below
def _handle_PacketIn(event):

    ''''Handle messages the switch has sent us because it has no
    matching rule.'
    '''
 Can you provide a the Python code you requested?
assistant
#Here is the Python code you requested.
    def drop():
        if (event.ofp.buffer_id is not None):
            msg = of.ofp_packet_out()
            msg.buffer_id = event.ofp.buffer_id
            msg.in_port = event.port
            event.connection.send(msg)
    packet = event.parsed
    if ((packet.type == packet.LLDP_TYPE) or packet.dst.isBridgeFiltered()):
        return drop()
    table[(event.connection, packet.src)] = event.port
    if (not packet.dst.is_multicast):
        dst_port = table.get((event.connection, packet.dst))
    else:
        dst_port = None
    if (dst_port is None):
        msg = of.ofp_packet_out(data=event.ofp)
        tree_ports = [p[1] for p in tree.get(event.dpid, [])]
        for p in event.connection.ports:
            if (p >= of.OFPP_MAX):
                continue
            if (not core.openflow_discovery.is_edge_port(event.dpid, p)):
                if (p not in tree_ports):
                    continue
            msg.actions.append(of.ofp_action_output(port=p))
        event.connection.send(msg)
    else:
        msg = of.ofp_flow_mod()
        msg.match.dl_dst = packet.src
        msg.match.dl_src = packet.dst
        msg.actions.append(of.ofp_action_output(port=event.port))
        event.connection.send(msg)
        msg = of.ofp_flow_mod()
        msg.data = event.ofp
        msg.match.dl_src = packet.src
        msg.match.dl_dst = packet.dst
        msg.actions.append(of.ofp_action_output(port=dst_port))
        event.connection.send(msg)
        log.debug(('Installing    %s    <->    %s' % (packet.src, packet.dst)))