Compare RSS feed enclosure length with content-length header of file when downloading the URL

feedsizes.py

"""Compare feed enclosure length with content-length of file url."""

import urllib.request
import xml.etree.ElementTree as etree

URL = 'https://feeds.feedburner.com/thebuglefeed?format=xml'


with urllib.request.urlopen(URL) as f:
    tree = etree.parse(f)

for item in tree.getroot().iterfind('channel/item/enclosure'):
    url = item.attrib['url']
    _, _, filename = url.rpartition('/')
    feedsize = int(item.attrib['length'])
    with urllib.request.urlopen(url) as f:
        size = int(f.headers['Content-Length'])
    flag = '!' if feedsize != size else ''
    print(f'{filename:50.50} {feedsize:d}\t{size:d} {flag}')