title: json dump to a file
body: <p>Hi have a json file as below - </p>
  
  <pre><code>{
      "Account": {
          "name": "demo_account_1",
          "Containers": [
              {
                  "name": "abcd",
                  "created_at": "1189090948.18945",
              },
              {
                  "name": "pqrs",
                  "created_at": "1234558.18945",
              }
          ]
      }
  </code></pre>
  
  <p>Now I want to populate this file this python script so that I can add more entries to Account or Containers. i.e after insertion of a container the file will look like -</p>
  
  <pre><code>{
      "Account": {
          "name": "demo_account_1",
          "Containers": [
              {
                  "name": "abcd",
                  "created_at": "1189090948.18945",
              },
              {
                  "name": "pqrs",
                  "created_at": "1234558.18945",
              },
              {
                  "name": "mnop",
                  "created_at": "100000.12345",
              }
          ]
      }
  </code></pre>