Setting up setup.py for packaging of a single .py file and a single data file without needing to create any folders

If you have a single-file module like this, no folder will be created, your .py file will be moved directly into the directory which contains the other python modules (/usr/lib/pythonX.X/site-packages/, for example). That’s why you have to create a directory:

$ .
|-- happy_birthday/
    |-- __init__.py
    |-- art.txt
|-- MANIFEST.in
|-- README.rst
|-- setup.py