title: how to install numpy for already installed python 3.8.1 on ubuntu 18.04
body: <p>I have three versions of python 2.7 , 3.6 and 3.8.
  I installed "numpy" on 3.8 many times but does not work on jupyter notebook.
  Any thing will be great help because i have a task to submit tonight</p>
  
  <pre><code>linux commands 
  &gt; sudo apt update
  &gt; sudo -H pip3 install --upgrade pip
  &gt; sudo -H pip3 install virtualenv
  &gt; mkdir ~/my_project_dir
  &gt; cd ~/my_project_dir
  </code></pre>
  
  <blockquote>
    <p>and here i ran a single command to install jupyter notebook , which i forgot but it was suggested to me by the terminal</p>
  </blockquote>