Wheel vs Egg#
Wheel and Egg are both packaging formats that aim to support the use case of needing an install artifact that doesn’t require building or compilation, which can be costly in testing and production workflows.
Wheel archives do not include .pyc files. Therefore, when the distribution only contains Python files (i.e. no compiled extensions), and is compatible with Python 2 and 3, it’s possible for a wheel to be «universal», similar to an sdist.
Wheel is versioned. Every wheel file contains the version of the wheel specification and the implementation that packaged it.