While producing a packaged Python code, which file can you leave empty? code example

Example 1: how to make python package

# This is too much for a grepper answer, so here is a link to the tutorial:
# https://towardsdatascience.com/how-to-build-your-first-python-package-6a00b02635c9

Example 2: python upload to pip

1. Create files:
    __init__.py   setup.py   README.md   LICENSE
2. Check for setuptools and wheel:
    pip install --user --upgrade setuptools wheel
3. Generate package:
    py setup.py sdist bdist_wheel
4. Upload to pip:
    twine upload dist/*