At some point, you may want to make your python module(s) available as a package. Let's take the most simple possible package, with only one function hello_world() which just writes "Hello world!" to the console. Lets make it available as a pip package called helloworld.

First, put your source code in a folder with the name of the package (helloworld). In the same directory, write a setup.py file with the following structure:

from setuptools import setup
setup(name='helloworld',
    version='0.1',
    description='A trivial hello world package for learning how to make a pip-installable python package',
    url='http://github.com/Mchristos/hello_world',
    author='mChristos',
    license='MIT',
    packages=['helloworld'],
    zip_safe=False)

In this case we just put our hello world function in a file called __init__.py inside the helloworld directory.

Now you can use the following pip command to install your package.

pip install .

The same statement with a -e flag makes changes in the source code immediately available on importing the package

pip install -e . 

Now, your package is available on your system. In your python console, test it by doing:

>>> import helloworld
>>> helloworld.hello_world()
### Hello world!