[Python-Dev] PEP 557 Data Classes 5th posting (original) (raw)
Eric V. Smith eric at trueblade.com
Sun Dec 3 12:07:15 EST 2017
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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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