title: How do I run Python Docker containers in the background and use them in my commands?
body: <p>I want to use different Python versions in my tests. I want to have 3 Docker containers for Python 3.6, Python 3.7 and Python 3.8 running and I want the commands <code>python3.6</code>, <code>python3.7</code>, <code>python3.8</code> to be accessible in the environment.</p>
  <p>If it can also associate these containers with just <code>python</code> command, that could help as well.</p>