[Python-ideas] Re: Anonymous namedtuples, revisited

March 29, 2022

      On 3/29/22 14:41, Christopher Barker wrote:
...
Ethan Furman queried:
...
...
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.
Ah, that's right -- it's saying that *instances* cannot have anything in `__slots__`, but the class can still have fields:

     >>> class Tuple(tuple):
     ...     this = 'eggs'
     ...     that = 'spam'
     ...     __slots__ = ()
     ...     def __new__(cls, *args):
     ...         return tuple.__new__(cls, *args)
     ...
     >>> t = Tuple((1,))
     >>> t
     (1,)
     >>> t.this
     'eggs'
     >>> t.that
     'spam'

So the Tuple class would have properties that redirect to the correct offset -- but that would require a different tuple 
class for each field configuration.

--
~Ethan~