Scrape "Appendix: Glossary of graph theory" (Wiktionary).

scrape-graph-glossary.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Scrape "Appendix: Glossary of graph theory" (Wiktionary)

Example:
  $ scrape-graph-glossary.py | sort -d | uniq

"""
import re
import urllib.request

URL = 'http://en.wiktionary.org/wiki/Appendix:Glossary_of_graph_theory'
DT_PATTERN = re.compile("<dt>(.+?)</dt>", re.I)
TAG_PATTERN = re.compile(r'<.*?>')

def main():
    with urllib.request.urlopen(URL) as fin:
        text = fin.read().decode('utf-8')
        termdefs = re.findall(DT_PATTERN, text)
        for i in termdefs:
            print(TAG_PATTERN.sub('', i.replace('&#160;', '')))

if __name__ == '__main__':
    main()