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[Python-Dev] doctest and pickle

Steven D'Aprano steve at pearwood.info
Sat Jun 8 08:45:49 CEST 2013 
On 08/06/13 15:18, Stephen J. Turnbull wrote:
> Ethan Furman writes:
>
>   > Enumerations can be pickled and unpickled::
>   >
>   >      >>> from enum import Enum
>   >      >>> class Fruit(Enum):
>   >      ...     tomato = 1
>   >      ...     banana = 2
>   >      ...     cherry = 3
>   >      ...
>   >      >>> from pickle import dumps, loads
>   >      >>> Fruit.tomato is loads(dumps(Fruit.tomato))
>   >      True
>   > [...]
>   > Still, it would be nice if this could work.
>
> Well, you could cheat and reverse the test. ;-)
>
> I assume the problem is that loads proceeds to recreate the Fruit
> enum, rather than checking if there already is one?


I don't believe so. I understand that the problem is that pickle cannot find the Fruit enum in the __main__ module.

Untested, but adding this before the call to dumps might work:

import __main__
__main__.Fruit = Fruit


although that's the sort of thing that makes me think it's time to turn this into a unittest rather than a doctest.



-- 
Steven
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