input: Write a python function to select articles with titles containing the word 'Python' from a list of dictionaries. 
  assert select_python_articles([{'title': 'Python Basics', 'content': 'Learn the basics of Python.'}, {'title': 'Advanced Java', 'content': 'Deep dive into Java.'}, {'title': 'Python Tips', 'content': 'Useful Python tips.'}]) == [{'title': 'Python Basics', 'content': 'Learn the basics of Python.'}, {'title': 'Python Tips', 'content': 'Useful Python tips.'}]
  assert select_python_articles([{'title': 'JavaScript Tutorial', 'content': 'Learn JavaScript.'}, {'title': 'Python for Data Science', 'content': 'Python in data science.'}, {'title': 'C++ Guide', 'content': 'C++ programming.'}]) == [{'title': 'Python for Data Science', 'content': 'Python in data science.'}]
  assert select_python_articles([{'title': 'Python Programming', 'content': 'Learn Python programming.'}, {'title': 'Ruby Guide', 'content': 'Learn Ruby.'}]) == [{'title': 'Python Programming', 'content': 'Learn Python programming.'}]
output: def select_python_articles(articles):
      return [article for article in articles if 'Python' in article['title']]