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Re: Python's sad, unimaginative Enum

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  Re: Python's sad, unimaginative Enum Jean-Michel Pichavant <jeanmichel@sequans.com> - 2013-05-13 13:00 +0200
    Re: Python's sad, unimaginative Enum Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-14 02:00 +0000

#45236 — Re: Python's sad, unimaginative Enum

----- Original Message -----
> That's the title of this little beast
> http://www.acooke.org/cute/Pythonssad0.html if anybody's interested.
> 
> --
> If you're using GoogleCrap™ please read this
> http://wiki.python.org/moin/GoogleGroupsPython.
> 
> Mark Lawrence
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
> 

python 2.5

class Enum:
  class __metaclass__(type):
    def __iter__(self):
      for attr in sorted(dir(self)):
        if not attr.startswith("__"):
          yield getattr(self, attr)

class Colours(Enum):
  RED = "red"
  GREEN = "green"

for c in Colours:
  print c

green
red


JM


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#45277

On Mon, 13 May 2013 13:00:36 +0200, Jean-Michel Pichavant wrote:

> ----- Original Message -----
>> That's the title of this little beast
>> http://www.acooke.org/cute/Pythonssad0.html if anybody's interested.
>> 
>> --
>> If you're using GoogleCrap™ please read this
>> http://wiki.python.org/moin/GoogleGroupsPython.
>> 
>> Mark Lawrence
>> 
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>> 
>> 
> python 2.5
> 
> class Enum:
>   class __metaclass__(type):
>     def __iter__(self):
>       for attr in sorted(dir(self)):
>         if not attr.startswith("__"):
>           yield getattr(self, attr)
> 
> class Colours(Enum):
>   RED = "red"
>   GREEN = "green"

py> class Experience(Enum):
...     NOVICE = 'novice'
...     GREEN = 'green'
...     EXPERIENCED = 'experienced'
...     MASTER = 'master'
...
py>
py> Colours.GREEN == Experience.GREEN
True


Oops.


It's very easy to make something which does a few things that enums 
should do, and call it an Enum. It's much harder to do a lot of things 
that enums should do.



-- 
Steven

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