e.  Over time, things change (<a class="reference external" href="https://packaging.python.org/discussions/wheel-vs-egg/">wheel vs egg</a>).  There appeared
to be version called the <a class="reference external" href="http://setuptools.readthedocs.io/en/latest/formats.html">egg</a> which is now deprecated in lieu of the <a class="reference external" href="https://pypi.org/project/wheel/">Python Wheel</a> and brought to us via <a class="reference external" href="https://www.python.org/dev/peps/pep-0427/#abst