Get destination from a redirecting URL

fetch_redirects.py

import requests

urls = []
with open('urls.txt', 'r') as f:
    urls = f.readlines()

redirects = {}


def find_destination(url):
    resp = requests.head(url)
    if 'Location' in resp.headers:
        return find_destination(resp.headers['Location'])
    return url

for url in urls:
    dest = find_destination(url)
    redirects[url] = dest

with open('redirects.txt', 'w+') as f:
    for old, new in redirects.iteritems():
        f.write(old + '\n' + new + '\n\n')