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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> - 2013-05-14 11:24 +0200
    Re: Python's sad, unimaginative Enum rusi <rustompmody@gmail.com> - 2013-05-14 19:40 -0700

#45292 — Re: Python's sad, unimaginative Enum

----- Original Message -----
> 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

I was just proposing a solution I've been using and found quite satisfactory. As for the perfect "enumness" of that solution, I don't know. To be honest, I'm not sure I know the exact definition of an enum, and whether or not the C enum fits 100% that definition. It does the job in python. Some people may find it useful, others may just ignore it.
Additionally, the "bug" you mentioned can be written in C as well, casts allow to compare apples and oranges:

(Colours::GREEN == (enum Coulours::Colour)Experiences::GREEN)


JM


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#45320

On May 14, 2:24 pm, Jean-Michel Pichavant <jeanmic...@sequans.com>
wrote:
> ----- Original Message -----
> > 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.htmlif 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
>
> I was just proposing a solution I've been using and found quite satisfactory. As for the perfect "enumness" of that solution, I don't know. To be honest, I'm not sure I know the exact definition of an enum, and whether or not the C enum fits 100% that definition. It does the job in python. Some people may find it useful, others may just ignore it.
> Additionally, the "bug" you mentioned can be written in C as well, casts allow to compare apples and oranges:
>
> (Colours::GREEN == (enum Coulours::Colour)Experiences::GREEN)


Enums are like names.
And like names are impossible to do right:
http://www.kalzumeus.com/2010/06/17/falsehoods-programmers-believe-about-names/

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