This is a big release in the history of attrs and finishes an arc that took way too long and also delayed this very overdue release. But it's done: import attrs that has been talked about for years[^issue], but fell victim to “just this one more thing” has finally landed.
The define/field APIs have been around for over a year and were very popular, now the rest of the package followed suit. I'm very excited that attrs remains relevant and keeps evolving over now more than half a decade. If you're curious about some of the background, the docs now contain a short explanation and history lesson. As long as our users keep pushing us, we will keep pushing forward class generation in Python!
Since the release took so long, there's more highlights than we can enumerate here, we'd just like to point out a breaking change in the new APIs: converters now run on setting attributes by default. If this is causing problems to you, you can disable that behavior by setting @define(on_setattr=[]).
[^issue]: I have an issue from 2018 that I wanted to "come back the moment this lands".
Full Changelog
Backward-incompatible Changes
When using @define, converters are now run by default when setting an attribute on an instance -- additionally to validators. I.e. the new default is on_setattr=[attrs.setters.convert, attrs.setters.validate].
This is unfortunately a breaking change, but it was an oversight, impossible to raise a DeprecationWarning about, and it's better to fix it now while the APIs are very fresh with few users. #835, #886
import attrs has finally landed! As of this release, you can finally import attrs using its proper name.
Not all names from the attr namespace have been transferred; most notably attr.s and attr.ib are missing. See attrs.define and attrs.field if you haven't seen our next-generation APIs yet. A more elaborate explanation can be found On The Core API Names
This feature is at least for one release provisional. We don't plan on changing anything, but such a big change is unlikely to go perfectly on the first strike.
The API docs have been mostly updated, but it will be an ongoing effort to change everything to the new APIs. Please note that we have not moved -- or even removed -- anything from attr!
Please do report any bugs or documentation inconsistencies! #887
Changes
attr.asdict(retain_collection_types=False) (default) dumps collection-esque keys as tuples. #646, #888
__match_args__ are now generated to support Python 3.10's Structural Pattern Matching. This can be controlled by the match_args argument to the class decorators on Python 3.10 and later. On older versions, it is never added and the argument is ignored. #815
If the class-level on_setattr is set to attrs.setters.validate (default in @define and @mutable) but no field defines a validator, pretend that it's not set. #817
The generated __repr__ is significantly faster on Pythons with f-strings. #819
Attributes transformed via field_transformer are wrapped with AttrsClass again. #824
Generated source code is now cached more efficiently for identical classes. #828
When using @define, converters are now run by default when setting an attribute on an instance -- additionally to validators.
I.e. the new default is on_setattr=[attrs.setters.convert, attrs.setters.validate].
This is unfortunately a breaking change, but it was an oversight, impossible to raise a DeprecationWarning about, and it's better to fix it now while the APIs are very fresh with few users.
[#835](https://github.com/python-attrs/attrs/issues/835) <https://github.com/python-attrs/attrs/issues/835>,
[#886](https://github.com/python-attrs/attrs/issues/886) <https://github.com/python-attrs/attrs/issues/886>
import attrs has finally landed!
As of this release, you can finally import attrs using its proper name.
Not all names from the attr namespace have been transferred; most notably attr.s and attr.ib are missing.
See attrs.define and attrs.field if you haven't seen our next-generation APIs yet.
A more elaborate explanation can be found On The Core API Names <https://www.attrs.org/en/latest/names.html>_
This feature is at least for one release provisional.
We don't plan on changing anything, but such a big change is unlikely to go perfectly on the first strike.
The API docs have been mostly updated, but it will be an ongoing effort to change everything to the new APIs.
Please note that we have not moved -- or even removed -- anything from attr!
Please do report any bugs or documentation inconsistencies!
[#887](https://github.com/python-attrs/attrs/issues/887) <https://github.com/python-attrs/attrs/issues/887>_
__match_args__ are now generated to support Python 3.10's
Structural Pattern Matching <https://docs.python.org/3.10/whatsnew/3.10.html#pep-634-structural-pattern-matching>.
This can be controlled by the match_args argument to the class decorators on Python 3.10 and later.
On older versions, it is never added and the argument is ignored.
[#815](https://github.com/python-attrs/attrs/issues/815) <https://github.com/python-attrs/attrs/issues/815>
If the class-level on_setattr is set to attrs.setters.validate (default in @define and @mutable) but no field defines a validator, pretend that it's not set.
[#817](https://github.com/python-attrs/attrs/issues/817) <https://github.com/python-attrs/attrs/issues/817>_
The generated __repr__ is significantly faster on Pythons with f-strings.
[#819](https://github.com/python-attrs/attrs/issues/819) <https://github.com/python-attrs/attrs/issues/819>_
Attributes transformed via field_transformer are wrapped with AttrsClass again.
[#824](https://github.com/python-attrs/attrs/issues/824) <https://github.com/python-attrs/attrs/issues/824>_
Generated source code is now cached more efficiently for identical classes.
[#828](https://github.com/python-attrs/attrs/issues/828) <https://github.com/python-attrs/attrs/issues/828>_
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Bumps attrs from 21.2.0 to 21.3.0.
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... (truncated)
Changelog
Sourced from attrs's changelog.
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Commits
dd26edd
Prepare 21.3.020bf4b6
Go over CONTRIBUTING.mdd528dd4
Fix more linksfcfb5a6
Last pass over changelogse098734
Add logo to PyPI description26c0cef
Streamline workflow3333e74
Remove dead achor2d77d83
Fix dataclass_transform linksb4dc9b0
Better 2.7 exampled4e3220
Use attrs namespace throughout examples.rstDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
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