title: Merge two json object in python
body: <p>I am merging two json in python</p>
  <p>I'm doing</p>
  <pre><code>import json
  
  json_obj = json.dumps({&quot;a&quot;: [1,2]})
  json_obj1 = json.dumps({&quot;a&quot;: [3,4]})
  
  json_obj += json_obj1
  
  print(json_obj)
  </code></pre>
  <p>I am expecting the output as</p>
  <pre><code>{&quot;a&quot;: [1, 2,3,4]}
  </code></pre>
  <p>but i got</p>
  <pre><code>{&quot;a&quot;: [1, 2]}{&quot;a&quot;: [3, 4]}
  </code></pre>
  <p>How to get the earlier one?</p>