cisco.py

def get_interfaces(fname):
    interfaces = []
    current = []
    with open(fname) as f:
        for line in f:
            line = line.strip()
            if line == '!':
                if current:
                    interfaces.append(current)
                    current = []
            else:
                current.append(line)
        if current:
            interfaces.append(current)

    interesting = []
    for interface in interfaces:
        if 'switchport port-security mac-address sticky' in interface and 'switchport port-security' not in interface:
            interesting.append(interface)

    return interesting