Here’s the updated script for Python 3, using the urllib.request module instead of the deprecated urllib2:

python
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import urllib.request

req = urllib.request.Request('http://www.python.org/')
# Here we request that bytes 18000--19000 be downloaded.
# The range is inclusive, and starts at 0.
req.headers['Range'] = f'bytes={18000}-{19000}'

with urllib.request.urlopen(req) as f:
    # This shows you the actual bytes that have been downloaded.
    content_range = f.headers.get('Content-Range')
    print(content_range)
    # bytes 18000-18030/18031