Parse the PortList output from SNMP OIDs like 'ieee8021QBridgeVlanCurrentEgressPorts'

portlist.py

def parsePortList(portlist):
    """
    Returns indexes of ports where
    VLAN is present.
    """
    port_status = []
    present_ports = []
    for values in portlist:
        for i, bit in enumerate('{:08b}'.format(values)):
            bit = int(bit)
            if bit:
                port_status.append(True)
            else:
                port_status.append(False)
    for index, state in enumerate(port_status):
        if state:
            present_ports.append(index+1)
    return present_ports