On Sun, Sep 22, 2013 at 9:04 PM, Ethan Furman <report@bugs.python.org>wrote:

>
> Ethan Furman added the comment:
>
> Yup, just trying to add some explanation on how it currently works.
>
> Drekin, I'm sure you've already figured this out, but for those who may
> read this in the future:  what you need is a helper function:
>
> def OptionalEnum(value):
>     "could also be OptionalEnum(enum, value)"
>     try:
>         return SomeEnum(value) # or return enum(value)
>     except ValueError:
>         return value
>

Hmm, looks suspiciously similar to _inienum_converter from socket.py ;-)