Creating an istallable Python package to print hello world

$ tree hello-package/
hello-package/
├── hello
│   ├── app.py
│   └── __main__.py
└── setup.py

examples/hello-package/hello/app.py

def say_it():
    print("Hello World!")

examples/hello-package/hello/main.py

from .app import say_it

say_it()

examples/hello-package/setup.py

from setuptools import setup

setup(
    name="hello",
    version="0.1.0",
    packages=["hello"],
    entry_points={
        "console_scripts": [
            "hello=hello.app:say_it",
         ]
    }
)

cd into the hello-package folder and we can run the code using python -m hello