The `__dict__` is needed to store the field names -- did you add `__dict__` to the `__slots__`?
Nope — though the error indicated that I couldn’t add anything to __slots__ when subclassing tuple. But I may have misunderstood the error. Also, frankly, I’m completely confused by __slots__ : looking at the namedtuple implementation, it sets slots to an empty tuple. But it does have instance attributes without a __dict__.
Maybe I'm being an ignoramus but: how would it be possible to even use slots? Slots
are descriptors living in the class namespace. You don't know ahead of time what the member names are, so you can't use slots, right?
The idea there is that you’d store the field names in a slot, and dynamically return the values in __getattr__. In that case, frozen dict would be nice :-) Anyway — good idea? I don’t know, ‘cause I did get it to work :-) -CHB
You can use them, just make sure one of the slots is `__dict__`.
Of course, by adding `__dict__` you lose most (all?) of the advantages of using `__slots__` in the first place.
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-- Christopher Barker, PhD (Chris) Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython