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Fri Sep 8 18:20:46 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-September/149404.html

On 2017-09-08 07:57, Eric V. Smith wrote:
> I've written a PEP for…

Apologies for the following list dumb questions and bikesheds:

- 'Classes can be thought of as "mutable namedtuples with defaults".'

   - A C/C++ (struct)ure sounds like a simpler description that many more
     would understand.

- dataclass name:

     - class, redundant
     - data, good but very common
     - struct, used?
     - Record?  (best I could come up with)

- Source needs blanks between functions, hard to read.

- Are types required?

   Maybe an example or two with Any?

- Intro discounts inheritance and metaclasses as "potentially interfering",
   but unclear why that would be the case.
   Inheritance is easy to override, metaclasses not sure?

- Perhaps mention ORMs/metaclass approach, as prior art:

   https://docs.djangoproject.com/en/dev/topics/db/models/

- Perhaps mention Kivy Properties, as prior art:

   https://kivy.org/docs/api-kivy.properties.html

- For mutable default values:

   @dataclass
   class C:
       x: list  # = field(default_factory=list)

   Could it detect list as a mutable class "type" and set it as a factory
   automatically?

   The PEP/bug #3 mentions using copy, but that's not exactly what I'm asking
   above.

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Showing content from https://mail.python.org/pipermail/python-dev/2017-September/149404.html below:

[Python-Dev] PEP 557: Data Classes