It still works I think - I added the ability to list all the interfaces if you just omit the '-i' argument, example:
[jrdalrymple@mn-lx9 pf_interface_usage]$ ./check_snmp_usage.py -H 192.168.0.1
No interface specified - here are your options:
pflow0
vlan301
vlan300
vlan1
vlan202
pflog0
vlan204
vlan200
vlan201
lo0
vlan203
enc0
em0
em3
em2
em1
vlan105
pppoe0
pflow1
