title: Python3: unable to import JSONDecodeError from json.decoder
body: <p>I setup virtualenv using python 3.4.3 and tried to import JSONDecodeError from json.decoder</p>
  
  <pre><code>from json.decoder import JSONDecodeError (I think its valid in python3 ? But why not working for me ?) 
  </code></pre>
  
  <p>But it is not working. Only below is working:</p>
  
  <pre><code>from simplejson import JSONDecodeError
  </code></pre>
  
  <p>How I did ?</p>
  
  <pre><code>virtualenv venv --no-site-packages -p python3 
  pip install ipython
  ipython
  from json.decoder import JSONDecodeError
  ImportError: cannot import name 'JSONDecodeError'
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/mkurT.png" rel="noreferrer"><img src="https://i.stack.imgur.com/mkurT.png" alt="enter image description here"></a></p>