title: Can I install Anaconda over a broken Anaconda install on MacOS?
body: <p>I want to run jupyter notebook, but the Mac I'm on has a messed up Anaconda environment. The old owner uninstalled some packages that I'd like to use-- jupyter notebook, pyzmq, etc.  I want to use jupyter notebook, but after I tried to reinstall those packages manually using:  </p>
  
  <pre class="lang-sh prettyprint-override"><code>pip install jupyter
  pip install pyzmq
  </code></pre>
  
  <p>I get errors when I run: <code>jupyter notebook</code>:  </p>
  
  <pre class="lang-py prettyprint-override"><code>Traceback (most recent call last):
    File "//anaconda/bin/jupyter-notebook", line 4, in &lt;module&gt; import notebook.notebookapp
    File "//anaconda/lib/python2.7/site-packages/notebook/notebookapp.py", line 40, in &lt;module&gt; ioloop.install()
    File "//anaconda/lib/python2.7/site-packages/zmq/eventloop/ioloop.py", line 210, in install assert (not ioloop.IOLoop.initialized()) or \
  AttributeError: type object 'IOLoop' has no attribute 'initialized'
  </code></pre>
  
  <p>Can I just reinstall Anaconda again (or do I have to uninstall anaconda somehow and install over a clean system)?</p>