title: Remove duplicates from json data
body: <p>Is there an efficient way to remove duplicates 'person_id' fields from this data with python? In this case just keep the first occurrence. </p>
  
  <pre><code>{
    {obj_id: 123,
      location: {
        x: 123,
        y: 323,
    },
    {obj_id: 13,
      location: {
        x: 23,
        y: 333,
    },
   {obj_id: 123,
      location: {
        x: 122,
        y: 133,
    },
  }
  </code></pre>
  
  <p>Should become:</p>
  
  <pre><code>{
    {obj_id: 123,
      location: {
        x: 123,
        y: 323,
    },
    {obj_id: 13,
      location: {
        x: 23,
        y: 333,
    },
  }
  </code></pre>