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attrs v18.2.0 Release Notes

Release Date: 2018-09-01 // over 5 years ago

  • 🗄 Deprecations ^

    • 🗄 Comparing subclasses using <, >, <=, and >= is now deprecated. The docs always claimed that instances are only compared if the types are identical, so this is a first step to conform to the docs.

    Equality operators (== and !=) were always strict in this regard. #394 <https://github.com/python-attrs/attrs/issues/394>_

    🔄 Changes ^

    • attrs now ships its own PEP 484 <https://www.python.org/dev/peps/pep-0484/>_ type hints. Together with mypy <http://mypy-lang.org>_'s attrs plugin, you've got all you need for writing statically typed code in both Python 2 and 3!

    At that occasion, we've also added narrative docs <https://www.attrs.org/en/stable/types.html>_ about type annotations in attrs. #238 <https://github.com/python-attrs/attrs/issues/238>_

    • Added kw_only arguments to attr.ib and attr.s, and a corresponding kw_only attribute to attr.Attribute. This change makes it possible to have a generated __init__ with keyword-only arguments on Python 3, relaxing the required ordering of default and non-default valued attributes. #281 <https://github.com/python-attrs/attrs/issues/281>, #411 <https://github.com/python-attrs/attrs/issues/411>
    • 👷 The test suite now runs with hypothesis.HealthCheck.too_slow disabled to prevent CI breakage on slower computers. #364 <https://github.com/python-attrs/attrs/issues/364>, #396 <https://github.com/python-attrs/attrs/issues/396>
    • attr.validators.in_() now raises a ValueError with a useful message even if the options are a string and the value is not a string. #383 <https://github.com/python-attrs/attrs/issues/383>_
    • attr.asdict() now properly handles deeply nested lists and dictionaries. #395 <https://github.com/python-attrs/attrs/issues/395>_
    • Added attr.converters.default_if_none() that allows to replace None values in attributes. For example attr.ib(converter=default_if_none("")) replaces None by empty strings. #400 <https://github.com/python-attrs/attrs/issues/400>, #414 <https://github.com/python-attrs/attrs/issues/414>
    • 🛠 Fixed a reference leak where the original class would remain live after being replaced when slots=True is set. #407 <https://github.com/python-attrs/attrs/issues/407>_
    • Slotted classes can now be made weakly referenceable by passing @attr.s(weakref_slot=True). #420 <https://github.com/python-attrs/attrs/issues/420>_
    • Added cache_hash option to @attr.s which causes the hash code to be computed once and stored on the object. #425 <https://github.com/python-attrs/attrs/issues/425>_
    • Attributes can be named property and itemgetter now. #430 <https://github.com/python-attrs/attrs/issues/430>_
    • It is now possible to override a base class' class variable using only class annotations. #431 <https://github.com/python-attrs/attrs/issues/431>_