Crawl urls loaded from a file and print the links found on them

crawler.py

#!/usr/bin/python

import sys
import urllib
from BeautifulSoup import BeautifulSoup, SoupStrainer
import re

filename = sys.argv[1]

with open(filename) as f:
    for line in f:
        print "Opening " + line
        html = urllib.urlopen(line).read()
        linksToBob = SoupStrainer('a', re.compile('bob.com/'))
        soup = BeautifulSoup.BeautifulSoup(html,parseOnlyThis=linksToBob)
        for tag in soup:
            try:
                print(tag['href'].encode('latin-1'))
            except KeyError:
                pass