Format is an alternative to the Egg and Wheel shields. It displays the best available format, showing wheel, egg and source.
Wheel will be green as it is currently the best available format, source will be yellow and is basically neutral and egg is red, because you shouldn't be using eggs anymore.
https://pypip.in/format/<PYPI_PKG_NAME>/badge.svg
.. image:: https://pypip.in/format/<PYPI_PKG_NAME>/badge.svg
:target: https://pypi.python.org/pypi/<PYPI_PKG_NAME>/
:alt: Download format
[![Download format](https://pypip.in/format/<PYPI_PKG_NAME>/badge.svg)](https://pypi.python.org/pypi/<PYPI_PKG_NAME>/)