Example of a python script which can specify its own dependencies, including python itself

contained.py

#! /usr/bin/env nix-shell
#! nix-shell -i python3 -p python3 -p python3Packages.requests -p python3Packages.fire

import requests
import fire

class CLI:
    
    def get(self, url):
        return requests.get(url).status_code

fire.Fire(CLI)