"installer" is a low-level library for installing a Python package from a wheel distribution; the wheel is the basic unit of Python module distribution to end users. It provides basic functionality and abstractions for handling wheels and installing packages from wheels, including:

* Logic for "unpacking" a wheel (i.e. installation). * Abstractions for various parts of the unpacking process. * Extensible simple implementations of the abstractions. * Platform-independent Python script wrapper generation.