title: How to install matplotlib in python3.7?
body: <p>I have error</p>
  
  <pre><code>No module named 'matplotlib'
  </code></pre>
  
  <p>I tried:</p>
  
  <pre><code>sudo apt install python3.7 matplotlib
  sudo apt install python3.7-matplotlib
  pip install python3.7-matplotlib
  </code></pre>
  
  <p>result:</p>
  
  <pre><code>No matching distribution found for python3.7-matplotlib
  </code></pre>
  
  <p>Thank you.</p>