input: Write a python function to extract articles from Wikipedia pages.
  assert 'Python is an interpreted, high-level, general-purpose programming language.' in extract_articles('Python (programming language)')
  assert 'Monty Python is a British surreal comedy group.' in extract_articles('Monty Python')
  assert 'Ball pythons are nonvenomous snakes found in Africa.' in extract_articles('Ball python')
output: def extract_articles(page_title):
      import wikipedia
      return wikipedia.page(page_title).content