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 -- https://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
