Hi everyone, I’m very excited to announce the 17.3.0 release of attrs <http://www.attrs.org/>, the package that will make you love writing classes again! A lot has happened under the hood but the main feature we’d like to point out is first-class support for types including PEP 526-style class variable annotations: ```pycon
@attr.s ... class C: ... x = attr.ib(type=int) ... y: int = attr.ib() attr.fields(C).x.type <class 'int'> attr.fields(C).y.type <class 'int'>
And if you’re OK with annotating *all* attributes, you can drop the `attr.ib()` completely with the new `auto_attribs` option. Anything that is assigned to the attributes and isn’t an `attr.ib` is used as a default value:
```pycon
>>> import typing
>>> @attr.s(auto_attribs=True)
... class AutoC:
... cls_var: typing.ClassVar[int] = 5 # this one is ignored
... l: typing.List[int] = attr.Factory(list)
... x: int = 1
... bar: typing.Any = None
>>> AutoC()
AutoC(l=[], x=1, bar=None)
Please note: - This feature works with Python 3.6 and later only. - The type information is currently *not* used by attrs itself, but it allows you to write advanced validators and serializers. Check out the changelog for all changes: <http://www.attrs.org/en/stable/changelog.html> Get it from PyPI: <https://pypi.org/project/attrs/> For the attrs team, Hynek Schlawack