title: Can't open jupyter notebook from terminal (Python 3.6)
body: <p>I really need your help, did extensive searching online but couldn't figure out, why I can't open the jupyter notebook from my terminal. If I type in</p>
  
  <pre><code>jupyter notebook
  </code></pre>
  
  <p>in the terminal, it says "Error executing Jupyter command 'notebook': [Errno 2] No such file or directory". So I checked if it's even installed with the command</p>
  
  <pre><code>jupyter --version
  </code></pre>
  
  <p>and the result was "4.3.0". Then I tried to change the directory to the path to the config-dir aswell as the data-dir, neither one did work. So I tried to uninstall with</p>
  
  <pre><code>pip uninstall jupyter
  </code></pre>
  
  <p>and I got the output "Cannot uninstall requirement jupyter, not installed". I tried to re-install it aswell with</p>
  
  <pre><code>pip install --upgrade --force-reinstall --no-cache-dir jupyter
  </code></pre>
  
  <p>but didn't work too. </p>
  
  <p>Can anyone help? How can I delete everything related to python from my mac so I can install it from zero again?</p>
  
  <p>Thanks for help! --batman</p>