It's recommend to create your own python virtualenv
$: mkdir zephyryproject
$: cd zephyryproject
$: python3 -m venv zephyr-venv
$: source zephyr-venv/bin/activate
To get the module you need to have west installed and use it as:
Install the west utility:
$: pip install west
Download the Zephyr-Application sources (Including Zephyr master revision):
$: west init -m https://github.com/jorisoffouga/zephyr-application.git
$: west update
At the end of the commands you have every metadata you need to start work with.