How a single file python libary might use setuptools

__init__.py

from one_file import *

one_file.py

def hello():
    print("hello, world!")

setup.py

from setuptools import setup

setup(name='One File Lib',
      version='0.1',
      description='A single file setuptools example',
      author='Ryan McGuire',
      author_email='ryan@enigmacurry.com',
      url='http://www.enigmacurry.com',
      license='Public Domain',
      packages=['one_file_lib'],
      include_package_data = True
      )