When and how to subclass Enum vs EnumMeta?

[Ethan Furman]

As more folks start using the Enum data type (introduced in 3.4) there are more questions on how extend them beyond 
"just" a name-value pair.

This question/answer on Stackoverflow:
  http://stackoverflow.com/q/43730305/208880

speaks to the issue of when it is appropriate to subclass EnumMeta, and how to 
do it*.

--
~Ethan~


* Yes, it is my question/answer.
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