- Replace urllib2/urlparse/StringIO with urllib.request/urllib.parse/io
- Replace unicode/basestring/long with str/bytes/int
- Fix except syntax (comma to as)
- Replace imp.load_source with importlib.util
- Replace HTMLParser().unescape with html.unescape
- Fix string.maketrans/translate for Python 3
- Fix integer division (/ to //) for scoring consistency
- Fix regex \p{} Unicode properties (unsupported in re module)
- Update etree.tostring to return str instead of bytes
- Fix relative imports in test modules
- Update beautifulsoup to beautifulsoup4
- Update test infrastructure for Python 3 compatibility
- Update .travis.yml for Python 3.8-3.12

Migrate codebase from Python 2 to Python 3