Reads a list with Indiana request records, filters wiki navigation, converts it to a readable format and prints it out again

filter_indy.py

#!/usr/bin/env python

import sys
import struct
from datetime import datetime

with open(sys.argv[1]) as file:
        outfile = open("wiki_" + sys.argv[1], "w")
        lines = [line.strip() for line in file.readlines()[1:]]
        records = [lines[3*i:3*i+3] for i in range(len(lines) / 3)]
        for record in records:
                if "en.wikipedia.org" in record[0] and "en.wikipedia.org" in record[1]:
                        date = str(datetime.fromtimestamp(struct.unpack("<L", record[0][:4])[0]))
                        referrer = record[0][6:]
                        target = record[1] + record[2]
                        outfile.write("\"" + date + "\",\"" + record[0][4:6] + "\",\"" + referrer + "\",\"" + target + "\"\n")