title: Double indexing in dictionaries
body: <p>I am trying to extract a piece of information, num_buy_ratings, from a dictionary as follows:</p>
  <p>In the first case, the dictionary is like</p>
  <pre><code>buy = robin_stocks.stocks.get_ratings(symbol, info='summary')  
  Out[96]: 
      {'summary': {'num_buy_ratings': 4,
        'num_hold_ratings': 2,
        'num_sell_ratings': 1},
       'ratings': [],
       'instrument_id': '4d591f16-7f0a-4fe7-a369-5346a61c0dfb',
       'ratings_published_at': None}
  </code></pre>
  <p>The next case, the dictionary is like</p>
  <pre><code>buy = robin_stocks.stocks.get_ratings(symbol, info='summary')
  Out[99]: {'num_buy_ratings': 25, 'num_hold_ratings': 12, 'num_sell_ratings': 4}
  </code></pre>
  <p>How do I access num_buy_ratings with one command instead of double-indexing in the 1st case and single-indexing in the latter?</p>