[Python-Dev] str(IntEnum)

[Brett Cannon]

On Fri Feb 20 2015 at 11:39:11 AM Demian Brecht <demianbrecht at gmail.com>
wrote:

> While working on a bug in the issue tracker, I came across something that
> I thought was a little odd around the behaviour of IntEnum. Should the
> behaviour of an instance of an IntEnum not be symmetric to an int where
> possible? For example:
>
> >>> class MyEnum(IntEnum):
> ...     FOO = 1
> ...
> >>> MyEnum.FOO == 1
> True
> >>> MyEnum.FOO * 3 == 3
> True
> >>> str(MyEnum.FOO) == str(1)
> False
>
> In my mind, the string representation here should be “1” and not the
> label. Was this simply an oversight of the specialized IntEnum
> implementation, or was there a concrete reason for this that I’m not seeing?
>

Concrete reason. The string is 'MyEnum.FOO' which is much more readable and
obvious where the value came from. The fact that it can be treated as an
int is the same as the reason True and False are subclasses of int; it made
practical sense for compatibility with what they typically replaced, but
where it made more sense to diverge and introduce new behaviour then we did
so.
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