input: Write a python function to parse an RSS feed and extract the titles and summaries of the articles. 
  assert len(get_rss_news('https://www.nytimes.com/svc/collections/v1/publish/www.nytimes.com/section/world/rss.xml')) > 0
  assert 'title' in get_rss_news('https://www.nytimes.com/svc/collections/v1/publish/www.nytimes.com/section/world/rss.xml')[0]
  assert 'summary' in get_rss_news('https://www.nytimes.com/svc/collections/v1/publish/www.nytimes.com/section/world/rss.xml')[0]
output: import feedparser
  
  def get_rss_news(url):
      feed = feedparser.parse(url)
      news_list = []
      for entry in feed.entries:
          news_item = {
              'title': entry.title,
              'summary': entry.summary
          }
          news_list.append(news_item)
      return news_list