title: Setting Python Version 3 on the Path
body: <p>I have the following:</p>
  <pre class="lang-none prettyprint-override"><code>joesan@joesan-InfinityBook-S-14-v5:~/Projects/Private/ml-projects/ml-data-preparation-sandbox$ sudo update-alternatives --config python
  update-alternatives: warning: alternative /usr/bin/python2.7 (part of link group python) doesn't exist; removing from list of alternatives
  There are 3 choices for the alternative python (providing /usr/bin/python).
  
    Selection    Path                Priority   Status
  ------------------------------------------------------------
    0            /usr/bin/python3.7   4         auto mode
  * 1            /usr/bin/python3.7   4         manual mode
    2            /usr/bin/python3.8   2         manual mode
    3            /usr/bin/python3.9   3         manual mode
  
  Press &lt;enter&gt; to keep the current choice[*], or type selection number: 
  update-alternatives: warning: forcing reinstallation of alternative /usr/bin/python3.7 because link group python is broken
  joesan@joesan-InfinityBook-S-14-v5:~/Projects/Private/ml-projects/ml-data-preparation-sandbox$ python3 --version
  Python 3.8.10
  </code></pre>
  <p>How can I set Python3.7 as the default? Should I change the priority? To use Zeppelin 0.10.0 I guess I need Python 3.7.</p>
  <p>EDIT: I installed pyenv and I have the following now:</p>
  <pre><code>joesan@joesan-InfinityBook-S-14-v5:~$ which python
  /home/joesan/.pyenv/shims/python
  joesan@joesan-InfinityBook-S-14-v5:~$ python --version
  Python 3.7.8
  joesan@joesan-InfinityBook-S-14-v5:~$ pyenv versions
    system
  * 3.7.8 (set by /home/joesan/.pyenv/version)
  joesan@joesan-InfinityBook-S-14-v5:~$ 
  </code></pre>