[Tutor] FrozenDict

[Oscar Benjamin]

On 8 October 2015 at 01:47, Steven D'Aprano <steve at pearwood.info> wrote:
> In 3.3, you will have a problem that FrozenDict is not a proper
> iterator. You can't set self.__next__ = self.next, that won't work.
> Dunder methods have to be on the class, not on the instance, so instead
> of making the assignment in the __init__ method, put this in the body of
> your class:
>
>     def next(self):
>         # Python 2 method
>         ...
>
>     __next__ = next  # Python 3 method.
>
>
> Unfortunately that's not enough to get it working in Python 3. I need
> more time to think about that.

There shouldn't be a __next__ method on the FrozenDict class. __iter__
should return a distinct iterator. Albert has already fixed this by
using:

    def __iter__(self):
        return iter(self.__kwargs)

--
Oscar