title: How to convert a DictProxy object into JSON serializable dict?
body: <p>I have a <code>DictProxy</code> object created using <code>multiprocessing.Manager().dict()</code> to support concurrency. At the end of the run, I need to serialize the dict to JSON. But it's unclear how to convert the <code>DictProxy</code> to serializable dict object. When I tried it, I got:</p>
  
  <pre class="lang-none prettyprint-override"><code>TypeError: &lt;DictProxy object, typeid 'dict' at 0x10a240ed0&gt; is not JSON serializable
  </code></pre>
  
  <p>How can I fix this?</p>