Should nested classes in an Enum be Enum members?

[Steven D'Aprano]

On Thu, 28 Jun 2018 20:34:58 +1000, Ben Finney wrote:

> Ethan Furman <ethan at stoneleaf.us> writes:
> 
>> Consider the following Enum definition:
>>
>>   class Color(Enum):
>>       RED = 1
>>       GREEN = 2
>>       BLUE = 3
>>       @property
>>       def lower(self):
>>           return self.name.lower()
>>       def spam(self):
>>           return "I like %s eggs and spam!" % self.lower
>>       class SomeClass:
>>           pass
> 
> That dumbfounds my intuitions.
> 
> Specifically, I can't make sense of why someone would want to have a
> class that is simultaneously behaving as an enumerated type, *and* has
> an API of custom callable attributes.


The PEP gives an example of enumerated members that themselves have 
methods.

https://www.python.org/dev/peps/pep-0435/


There was another example somewhere (I don't remember where) of an 
enumeration of the planets, where planets can have attributes and methods:

Planet.MARS.mass
Planet.JUPITER.moons()


which is no more weird than this:

class Planet(Enum):
    MARS = "the red planet"

Planet.MARS.upper()


-- 
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson