Your own package index or index mirror

There are three main reasons why you might want to run your own index of Python packages:

• The official Python Package Index does not have any availability guarantees. It is run by Python Software Foundation thanks to numerous donations. Because of that, it very often means that this site can be down. You don't want to stop your deployment or packaging process in the middle due to PyPI outage.

• It is useful to have reusable components written in Python properly packaged even for the closed source that will never be published publicly. It simplifies the code base because packages that are used across the company for different projects do not need to be vendored. You can simply install them from the repository. This simplifies maintenance for such shared code and might reduce development costs for the whole company if it has many teams working on different projects.

• It is very good practice to have your entire project packaged using setuptools. Then, deployment...