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Sun Dec 3 12:07:15 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-December/151024.html

On 12/3/2017 11:56 AM, Guido van Rossum wrote:
> Not sure I like that better. It's an open-ended sequence of homogeneous 
> types. What's the advantage of a tuple? I don't want to blindly follow 
> existing APIs.

So people don't modify it, but consenting adults would say "don't do 
that". I currently return a new tuple in each call to fields(), but in 
the future I might return the same one every time (per class).

I really don't care so much. The only reason I made any change was 
because the implementation was returning an OrderedDict, so I was 
changing the tests anyway. I'm happy to change it back to a list, based 
on the convention of homogeneous types being in a list.

Eric.

> 
> On Sun, Dec 3, 2017 at 6:55 AM, Eric V. Smith <eric at trueblade.com 
> <mailto:eric at trueblade.com>> wrote:
> 
>     I've made a minor change: the return type of fields() is now a
>     tuple, it was a list.
> 
>     Eric.
> 
>     On 12/2/2017 9:02 AM, Eric V. Smith wrote:
> 
>         I've pushed another version of PEP 557. The only difference is
>         changing the default value of "order" to False instead of True.
>         This matches regular classes: instances can be tested for
>         equality, but are unordered.
> 
>         Discussion at
>         https://github.com/ericvsmith/dataclasses/issues/104
>         <https://github.com/ericvsmith/dataclasses/issues/104>
> 
>         It's already available at
>         https://www.python.org/dev/peps/pep-0557/
>         <https://www.python.org/dev/peps/pep-0557/>
> 
>         I've updated the implementation on PyPI to reflect this change:
>         https://pypi.python.org/pypi/dataclasses/0.3
>         <https://pypi.python.org/pypi/dataclasses/0.3>
> 
>         Eric.
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> -- 
> --Guido van Rossum (python.org/~guido <http://python.org/%7Eguido>)

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[Python-Dev] PEP 557 Data Classes 5th posting