title: Convert list of dictionaries to nested dictionary
body: <p>There are a number of questions on this topic but I have not yet been able to adapt solutions to fit my case. Supposed I have a list of dictionaries that I got from a flat file:</p>
  
  <pre><code>[{'Name': 'Jim', 'Attribute': 'Height', 'Value': '6.3'},
   {'Name': 'Jim', 'Attribute': 'Weight', 'Value': '170'},
   {'Name': 'Mary', 'Attribute': 'Height', 'Value': '5.5'},
   {'Name': 'Mary', 'Attribute': 'Weight', 'Value': '140'}]
  </code></pre>
  
  <p>and I want to convert it to a nested dictionary such that the attribute/value pairs are associated to each name:</p>
  
  <pre><code>{ 
      'Jim': {'Height': '6.3', 'Weight': '170'},
      'Mary': {'Height': '5.5', 'Weight': '140'}
  }
  </code></pre>