title: How to merge a list of dictionaries into a dictionary
body: <p>I have a python list of dictionaries like this:</p>
  
  <pre><code>[{'George': {u'finance': {u'investing': {u'venture capital': 'Peter'}}}},
   {'George': {u'finance': {u'investing': {u'venture capital': 'John'}}}},
   {'George': {u'finance': {u'investing': {u'venture capital': 'Kate'}}}}]
  </code></pre>
  
  <p>And I want to groupby so the final results would be:</p>
  
  <pre><code>{'George': {u'finance': {u'investing': {u'venture capital': ['Peter','John','Kate'}}}}
  </code></pre>
  
  <p>How do i groupby this list of dictionaries ? </p>