[Steven D'Aprano]
> But if I try to create a regular dict from this, dict() doesn't call my
> __getitem__ method:
>> >>> dict(d)
>> {0: ('a', 'extra_data'), 1: ('b', 'extra_data')}
>> instead of {0: 'a', 1: 'b'} as I expected.
>> How can I fix this?
Try using dict(d.items()).
Raymond