Could these be things in types?
types.ClassType types.InstanceType
types.DataClass types.DataClassInstanceType (?)
I sent a PR with typo fixes and ``.. code:: python`` directives so that syntax highlighting works (at least on GitHub).
https://github.com/python/peps/blob/master/pep-0557.rst
https://github.com/python/peps/pull/488
Additional notes:
- "DataClass" instead of "Data Class" would be easier to search for. s/DataClass/Data Class/g? - It's probably worth mentioning how hash works when frozen=True also here: https://github.com/python/peps/blob/master/pep-0557.rst#frozen-instances - The `hash` explanation could be a two column table for easier readability
What a great feature.
- Runtime data validation from annotations (like PyContracts,) would be cool - __slots__ are worth the time
On Thursday, November 30, 2017, Antoine Pitrou solipsis@pitrou.net wrote:
isdataclass() testing for instance-ship does sound like a bug magnet to me.
If isdataclassinstance() is too long (that's understandable), how about isdatainstance()?
Regards
Antoine.
On Wed, 29 Nov 2017 17:02:21 -0800 Guido van Rossum <guido@python.org javascript:;> wrote:
On Wed, Nov 29, 2017 at 3:51 PM, Carl Meyer <carl@oddbird.net
javascript:;> wrote:
On 11/29/2017 03:26 PM, Eric V. Smith wrote:
I've posted a new version of PEP 557, it should soon be available at https://www.python.org/dev/peps/pep-0557/.
The only significant changes since the last version are:
- changing the "compare" parameter to be "order", since that more
accurately reflects what it does.
- Having the combination of "eq=False" and "order=True" raise an
exception instead of silently changing eq to True.
There were no other issues raised with the previous version of the
PEP.
Not quite; I also raised the issue of isdataclass(ADataClass) returning False. I still think that's likely to be a cause of bug reports if left as-is.
I tried to look up the discussion but didn't find much except that you flagged this as an issue. To repeat, your concern is that isdataclass() applies to *instances*, not classes, which is how Eric has designed it,
but
you worry that either through the name or just because people don't read the docs it will be confusing. What do you suppose we do? I think making
it
work for classes as well as for instances would cause another category of bugs (confusion between cases where a class is needed vs. an instance abound in other situations -- we don't want to add to that). Maybe it should raise TypeError when passed a class (unless its metaclass is a dataclass)? Maybe it should be renamed to isdataclassinstance()? That's a mouthful, but I don't know how common the need to call this is, and
people
who call it a lot can define their own shorter alias.
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