Take a list (or a csv for that matter) of IP addresses and convert them to integer form. Prints to stdout for flexibility so just use a redirector

ip_to_integer.py

import csv

with open('iplist.csv','r') as csvinput:
        reader = csv.reader(csvinput)
        print('ip_addr,ip_int')
        for row in reader:
           a,b,c,d = row[0].split('.')
           n = (int(a) * 16777216) + (int(b) * 65536) + (int(c) * 256) + int(d)
           print(row[0], n, sep=',')