Python 3.7 (or higher).

<details open><summary><strong>Why are virtual environments and tests not covered?</strong></summary><br>

&nbsp;&nbsp;&nbsp;&nbsp;Check out <a href="https://docs.python-guide.org/">The Hitchhiker’s Guide to Python</a> for a nice overview of the mentioned topics.<br><br>

&nbsp;&nbsp;&nbsp;&nbsp;A quick overview of virtual environments in Unix:<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<code>python3 -m venv env&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# Creates virtual environment in current directory.</code><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<code>source env/bin/activate&nbsp;&nbsp;# Activates virtual environment.</code><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<code>deactivate&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# Deactivates virtual environment.</code><br><br>

&nbsp;&nbsp;&nbsp;&nbsp;And Windows:<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<code>py -m venv env&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# Creates virtual environment in current directory.</code><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<code>.\env\Scripts\activate&nbsp;&nbsp;&nbsp;# Activates virtual environment.</code><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<code>deactivate&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# Deactivates virtual environment.</code><br><br>