Since pip is a command-line-tool, it does not have an official,
supported, importable API.

However, this does not mean that people haven't tried to import
pip, usually to end up with much headache when pip's maintainers
do routine refactoring.

This project attempts to provide an importable pip API, which is
fully compliant with the recommended method of using pip from your
program.

Homepage:
https://github.com/di/pip-api
