title: List of unique dictionaries
body: <p>Let's say I have a list of dictionaries:</p>
  <pre><code>[
      {'id': 1, 'name': 'john', 'age': 34},
      {'id': 1, 'name': 'john', 'age': 34},
      {'id': 2, 'name': 'hanna', 'age': 30},
  ]
  </code></pre>
  <p>How can I obtain a list of unique dictionaries (removing the duplicates)?</p>
  <pre><code>[
      {'id': 1, 'name': 'john', 'age': 34},
      {'id': 2, 'name': 'hanna', 'age': 30},
  ]
  </code></pre>