What is the minimum number of files in the project and with what content to deploy the script on Heroku?

Question

Python

There is a script

import sys
print (sys.version[::-1])

What files besides this script should be in the project and what should they contain in order to see the result?

Answer 1

One python script and one Procfile is enough, which contains the command to run the script. The script must, at a minimum, open a socket serving connections. And you will see the result if it is written to the socket.
Using Flask, for example:

import os
import sys
from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello():
    return sys.version[::-1]

if __name__ == "__main__":
    port = int(os.environ.get('PORT', 5000))
    app.run(host='0.0.0.0', port=port)

web: python app.py