Create iptables accounting rule using python

iptables_acct.py

# -*- coding: utf-8 -*-

import iptc

def add_port_out_monitor(ip="10.0.2.15", port="9999"):
    table = iptc.Table(iptc.Table.FILTER)
    chain = iptc.Chain(table, "OUTPUT")
    rule = iptc.Rule()

    rule.src = ip
    rule.protocol = "tcp"

    match = iptc.Match(rule, "tcp")
    match.sport = port
    rule.add_match(match)

    target = rule.create_target("ACCEPT")
    chain.insert_rule(rule)

def get_flow():
    table = iptc.Table(iptc.Table.FILTER)
    chain = iptc.Chain(table, 'OUTPUT')
    for rule in chain.rules:
        for match in rule.matches:
            (packets, bytes) = rule.get_counters()
            print packets, bytes, match.name, match.sport

Source: http://blog.yunlong.me/2015/03/09/port-flow-control/