title: Python set environment variable when creating venv
body: <p>In my project I use the built-in python virtual env (<code>python -m venv</code>).<br>
  To set environment variables I add multiple <code>export VAR1=VALUE1</code> to the end of the <code>venv/bin/activate</code>.<br>
  Obviously, when I delete the venv and create a new one, for example with the new python version all my env variables get lost.<br>
  So, is there a way to preserve them? May be it is possible to define env variables when creating the venv?</p>