title: How to install Python packages in a specific environment?
body: <p>I installed Anaconda3 so I can create environments and install different packages in each environment. But I fail to understand the difference between the Python in</p>
  
  <pre><code>/usr/bin/python
  </code></pre>
  
  <p>and</p>
  
  <pre><code>/opt/anaconda3/bin/python
  </code></pre>
  
  <p>I can seem to access Python 3.6.5 Anaconda from both, why is that? And, what is the difference between both?</p>
  
  <p>Furthermore, I would like to install packages to a single Python environment only. </p>