chore(deps): update dependency attrs to v26

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
attrs (changelog)	==18.2.0 → ==26.1.0

---

Release Notes

python-attrs/attrs (attrs)

v26.1.0

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Backwards-incompatible Changes

• Field aliases are now resolved before calling field_transformer, so transformers receive fully populated Attribute objects with usable alias values instead of None.
  The new Attribute.alias_is_default flag indicates whether the alias was auto-generated (True) or explicitly set by the user (False).
  #​1509

Changes

• Fix type annotations for attrs.validators.optional(), so it no longer rejects tuples with more than one validator.
  #​1496
• The attrs.validators.disabled() contextmanager can now be nested.
  #​1513
• Frozen classes can set on_setattr=attrs.setters.NO_OP in addition to None.
  #​1515
• It's now possible to pass attrs instances in addition to attrs classes to attrs.fields().
  #​1529

v25.4.0

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Backwards-incompatible Changes

• Class-level kw_only=True behavior is now consistent with dataclasses.

  Previously, a class that sets kw_only=True makes all attributes keyword-only, including those from base classes.
  If an attribute sets kw_only=False, that setting is ignored, and it is still made keyword-only.

  Now, only the attributes defined in that class that doesn't explicitly set kw_only=False are made keyword-only.

  This shouldn't be a problem for most users, unless you have a pattern like this:

  @attrs.define(kw_only=True)
  class Base:
      a: int
      b: int = attrs.field(default=1, kw_only=False)
  
  @attrs.define
  class Subclass(Base):
      c: int

  Here, we have a kw_only=True attrs class (Base) with an attribute that sets kw_only=False and has a default (Base.b), and then create a subclass (Subclass) with required arguments (Subclass.c).
  Previously this would work, since it would make Base.b keyword-only, but now this fails since Base.b is positional, and we have a required positional argument (Subclass.c) following another argument with defaults.
  #​1457

Changes

• Values passed to the __init__() method of attrs classes are now correctly passed to __attrs_pre_init__() instead of their default values (in cases where kw_only was not specified).
  #​1427

• Added support for Python 3.14 and PEP 749.
  #​1446,
  #​1451

• attrs.validators.deep_mapping() now allows to leave out either key_validator xor value_validator.
  #​1448

• attrs.validators.deep_iterator() and attrs.validators.deep_mapping() now accept lists and tuples for all validators and wrap them into a attrs.validators.and_().
  #​1449

• Added a new experimental way to inspect classes:

  attrs.inspect(cls) returns the effective class-wide parameters that were used by attrs to construct the class.

  The returned class is the same data structure that attrs uses internally to decide how to construct the final class.
  #​1454

• Fixed annotations for attrs.field(converter=...).
  Previously, a tuple of converters was only accepted if it had exactly one element.
  #​1461

• The performance of attrs.asdict() has been improved by 45–260%.
  #​1463

• The performance of attrs.astuple() has been improved by 49–270%.
  #​1469

• The type annotation for attrs.validators.or_() now allows for different types of validators.

  This was only an issue on Pyright.
  #​1474

v25.3.0

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Changes

• Restore support for generator-based field_transformers.
  #​1417

v25.2.0

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Changes

• Checking mandatory vs non-mandatory attribute order is now performed after the field transformer, since the field transformer may change attributes and/or their order.
  #​1147
• attrs.make_class() now allows for Unicode class names.
  #​1406
• Speed up class creation by 30%-50% by compiling methods only once and using a variety of other techniques.
  #​1407
• The error message if an attribute has both an annotation and a type argument will now disclose what attribute seems to be the problem.
  #​1410

v25.1.0

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Changes

• This release only ensures correct PyPI licensing metadata.
  #​1386

v24.3.0

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Backwards-incompatible Changes

• Python 3.7 has been dropped.
  #​1340

Changes

• Introduce attrs.NothingType, for annotating types consistent with attrs.NOTHING.
  #​1358
• Allow mutating __suppress_context__ and __notes__ on frozen exceptions.
  #​1365
• attrs.converters.optional() works again when taking attrs.converters.pipe() or another Converter as its argument.
  #​1372
• attrs instances now support copy.replace().
  #​1383
• attrs.validators.instance_of()'s type hints now allow for union types.
  For example: instance_of(str | int)
  #​1385

v24.2.0

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Deprecations

• Given the amount of warnings raised in the broader ecosystem, we've decided to only soft-deprecate the hash argument to @define / @attr.s.
  Please don't use it in new code, but we don't intend to remove it anymore.
  #​1330

Changes

• attrs.converters.pipe() (and its syntactic sugar of passing a list for attrs.field()'s / attr.ib()'s converter argument) works again when passing attrs.setters.convert to on_setattr (which is default for attrs.define).
  #​1328
• Restored support for PEP 649 / 749-implementing Pythons -- currently 3.14-dev.
  #​1329

v24.1.0

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Backwards-incompatible Changes

• attrs.evolve() doesn't accept the inst argument as a keyword argument anymore.
  Pass it as the first positional argument instead.
  #​1264

• attrs.validators.provides() has been removed.
  The removed code is available as a gist for convenient copy and pasting.
  #​1265

• All packaging metadata except from __version__ and __version_info__ has been removed from the attr and attrs modules (for example, attrs.__url__).

  Please use importlib.metadata or importlib-metadata instead.
  #​1268

• The generated __eq__ methods have been sped up significantly by generating a chain of attribute comparisons instead of constructing and comparing tuples.
  This change arguably makes the behavior more correct,
  but changes it if an attribute compares equal by identity but not value, like float('nan').
  #​1310

Deprecations

• The repr_ns argument to attr.s is now deprecated.
  It was a workaround for nested classes in Python 2 and is pointless in Python 3.
  #​1263
• The hash argument to @attr.s, @attrs.define, and make_class() is now deprecated in favor of unsafe_hash, as defined by PEP 681.
  #​1323

Changes

• Allow original slotted functools.cached_property classes to be cleaned by garbage collection.
  Allow super() calls in slotted cached properties.
  #​1221

• Our type stubs now use modern type notation and are organized such that VS Code's quick-fix prefers the attrs namespace.
  #​1234

• Preserve AttributeError raised by properties of slotted classes with functools.cached_properties.
  #​1253

• It is now possible to wrap a converter into an attrs.Converter and get the current instance and/or the current field definition passed into the converter callable.

  Note that this is not supported by any type checker, yet.
  #​1267

• attrs.make_class() now populates the __annotations__ dict of the generated class, so that attrs.resolve_types() can resolve them.
  #​1285

• Added the attrs.validators.or_() validator.
  #​1303

• The combination of a __attrs_pre_init__ that takes arguments, a kw-only field, and a default on that field does not crash anymore.
  #​1319

• attrs.validators.in_() now transforms certain unhashable options to tuples to keep the field hashable.

  This allows fields that use this validator to be used with, for example, attrs.filters.include().
  #​1320

• If a class has an inherited method called __attrs_init_subclass__, it is now called once the class is done assembling.

  This is a replacement for Python's __init_subclass__ and useful for registering classes, and similar.
  #​1321

v23.2.0

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Changes

• The type annotation for attrs.resolve_types() is now correct.
  #​1141
• Type stubs now use typing.dataclass_transform to decorate dataclass-like decorators, instead of the non-standard __dataclass_transform__ special form, which is only supported by Pyright.
  #​1158
• Fixed serialization of namedtuple fields using attrs.asdict/astuple() with retain_collection_types=True.
  #​1165
• attrs.AttrsInstance is now a typing.Protocol in both type hints and code.
  This allows you to subclass it along with another Protocol.
  #​1172
• If attrs detects that __attrs_pre_init__ accepts more than just self, it will call it with the same arguments as __init__ was called.
  This allows you to, for example, pass arguments to super().__init__().
  #​1187
• Slotted classes now transform functools.cached_property decorated methods to support equivalent semantics.
  #​1200
• Added class_body argument to attrs.make_class() to provide additional attributes for newly created classes.
  It is, for example, now possible to attach methods.
  #​1203

v23.1.0

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Backwards-incompatible Changes

• Python 3.6 has been dropped and packaging switched to static package data using Hatch.
  #​993

Deprecations

• The support for zope-interface via the attrs.validators.provides validator is now deprecated and will be removed in, or after, April 2024.

  The presence of a C-based package in our development dependencies has caused headaches and we're not under the impression it's used a lot.

  Let us know if you're using it and we might publish it as a separate package.
  #​1120

Changes

• attrs.filters.exclude() and attrs.filters.include() now support the passing of attribute names as strings.
  #​1068

• attrs.has() and attrs.fields() now handle generic classes correctly.
  #​1079

• Fix frozen exception classes when raised within, for example, contextlib.contextmanager, which mutates their __traceback__ attributes.
  #​1081

• @frozen now works with type checkers that implement PEP-681 (ex. pyright).
  #​1084

• Restored ability to unpickle instances pickled before 22.2.0.
  #​1085

• attrs.asdict()'s and attrs.astuple()'s type stubs now accept the attrs.AttrsInstance protocol.
  #​1090

• Fix slots class cellvar updating closure in CPython 3.8+ even when __code__ introspection is unavailable.
  #​1092

• attrs.resolve_types() can now pass include_extras to typing.get_type_hints() on Python 3.9+, and does so by default.
  #​1099

• Added instructions for pull request workflow to CONTRIBUTING.md.
  #​1105

• Added type parameter to attrs.field() function for use with attrs.make_class().

  Please note that type checkers ignore type metadata passed into make_class(), but it can be useful if you're wrapping attrs.
  #​1107

• It is now possible for attrs.evolve() (and attr.evolve()) to change fields named inst if the instance is passed as a positional argument.

  Passing the instance using the inst keyword argument is now deprecated and will be removed in, or after, April 2024.
  #​1117

• attrs.validators.optional() now also accepts a tuple of validators (in addition to lists of validators).
  #​1122

v22.2.0

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Backwards-incompatible Changes

• Python 3.5 is not supported anymore.
  #​988

Deprecations

• Python 3.6 is now deprecated and support will be removed in the next release.
  #​1017

Changes

• attrs.field() now supports an alias option for explicit __init__ argument names.

  Get __init__ signatures matching any taste, peculiar or plain!
  The PEP 681 compatible alias option can be use to override private attribute name mangling, or add other arbitrary field argument name overrides.
  #​950

• attrs.NOTHING is now an enum value, making it possible to use with, for example, typing.Literal.
  #​983

• Added missing re-import of attr.AttrsInstance to the attrs namespace.
  #​987

• Fix slight performance regression in classes with custom __setattr__ and speedup even more.
  #​991

• Class-creation performance improvements by switching performance-sensitive templating operations to f-strings.

  You can expect an improvement of about 5% -- even for very simple classes.
  #​995

• attrs.has() is now a TypeGuard for AttrsInstance.
  That means that type checkers know a class is an instance of an attrs class if you check it using attrs.has() (or attr.has()) first.
  #​997

• Made attrs.AttrsInstance stub available at runtime and fixed type errors related to the usage of attrs.AttrsInstance in Pyright.
  #​999

• On Python 3.10 and later, call abc.update_abstractmethods() on dict classes after creation.
  This improves the detection of abstractness.
  #​1001

• attrs's pickling methods now use dicts instead of tuples.
  That is safer and more robust across different versions of a class.
  #​1009

• Added attrs.validators.not_(wrapped_validator) to logically invert wrapped_validator by accepting only values where wrapped_validator rejects the value with a ValueError or TypeError (by default, exception types configurable).
  #​1010

• The type stubs for attrs.cmp_using() now have default values.
  #​1027

• To conform with PEP 681, attr.s() and attrs.define() now accept unsafe_hash in addition to hash.
  #​1065

v22.1.0

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Backwards-incompatible Changes

• Python 2.7 is not supported anymore.

  Dealing with Python 2.7 tooling has become too difficult for a volunteer-run project.

  We have supported Python 2 more than 2 years after it was officially discontinued and feel that we have paid our dues.
  All version up to 21.4.0 from December 2021 remain fully functional, of course.
  #​936

• The deprecated cmp attribute of attrs.Attribute has been removed.
  This does not affect the cmp argument to attr.s that can be used as a shortcut to set eq and order at the same time.
  #​939

Changes

• Instantiation of frozen slotted classes is now faster.
  #​898
• If an eq key is defined, it is also used before hashing the attribute.
  #​909
• Added attrs.validators.min_len().
  #​916
• attrs.validators.deep_iterable()'s member_validator argument now also accepts a list of validators and wraps them in an attrs.validators.and_().
  #​925
• Added missing type stub re-imports for attrs.converters and attrs.filters.
  #​931
• Added missing stub for attr(s).cmp_using().
  #​949
• attrs.validators._in()'s ValueError is not missing the attribute, expected options, and the value it got anymore.
  #​951
• Python 3.11 is now officially supported.
  #​969

v21.4.0

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Changes

• Fixed the test suite on PyPy3.8 where cloudpickle does not work.
  #​892
• Fixed coverage report for projects that use attrs and don't set a --source.
  #​895,
  #​896

v21.3.0

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Backward-incompatible Changes

• When using @define, converters are now run by default when setting an attribute on an instance -- additionally to validators.
  Meaning: 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
• Added attrs.converters.to_bool().
  #​830
• attrs.resolve_types() now resolves types of subclasses after the parents are resolved.
  #​842
  #​843
• Added new validators: lt(val) (< val), le(va) (≤ val), ge(val) (≥ val), gt(val) (> val), and maxlen(n).
  #​845
• attrs classes are now fully compatible with cloudpickle (no need to disable repr anymore).
  #​857
• Added new context manager attrs.validators.disabled() and functions attrs.validators.(set|get)_disabled().
  They deprecate attrs.(set|get)_run_validators().
  All functions are interoperable and modify the same internal state.
  They are not – and never were – thread-safe, though.
  #​859
• attrs.validators.matches_re() now accepts pre-compiled regular expressions in addition to pattern strings.
  #​877

---

v21.2.0

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Backward-incompatible Changes

• We had to revert the recursive feature for attr.evolve() because it broke some use-cases -- sorry!
  #​806
• Python 3.4 is now blocked using packaging metadata because attrs can't be imported on it anymore.
  To ensure that 3.4 users can keep installing attrs easily, we will yank 21.1.0 from PyPI.
  This has no consequences if you pin attrs to 21.1.0.
  #​807

v21.1.0

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Backward-incompatible Changes

• We had to revert the recursive feature for attr.evolve() because it broke some use-cases -- sorry!
  #​806
• Python 3.4 is now blocked using packaging metadata because attrs can't be imported on it anymore.
  To ensure that 3.4 users can keep installing attrs easily, we will yank 21.1.0 from PyPI.
  This has no consequences if you pin attrs to 21.1.0.
  #​807

v20.3.0

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Backward-incompatible Changes

• attr.define(), attr.frozen(), attr.mutable(), and attr.field() remain provisional.

  This release does not change anything about them and they are already used widely in production though.

  If you wish to use them together with mypy, you can simply drop this plugin into your project.

  Feel free to provide feedback to them in the linked issue #​668.

  We will release the attrs namespace once we have the feeling that the APIs have properly settled.
  #​668

Changes

• attr.s() now has a field_transformer hook that is called for all Attributes and returns a (modified or updated) list of Attribute instances.
  attr.asdict() has a value_serializer hook that can change the way values are converted.
  Both hooks are meant to help with data (de-)serialization workflows.
  #​653
• kw_only=True now works on Python 2.
  #​700
• raise from now works on frozen classes on PyPy.
  #​703,
  #​712
• attr.asdict() and attr.astuple() now treat frozensets like sets with regards to the retain_collection_types argument.
  #​704
• The type stubs for attr.s() and attr.make_class() are not missing the collect_by_mro argument anymore.
  #​711

---

v20.2.0

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Backward-incompatible Changes

• attr.define(), attr.frozen(), attr.mutable(), and attr.field() remain provisional.

  This release fixes a bunch of bugs and ergonomics but they remain mostly unchanged.

  If you wish to use them together with mypy, you can simply drop this plugin into your project.

  Feel free to provide feedback to them in the linked issue #​668.

  We will release the attrs namespace once we have the feeling that the APIs have properly settled.
  #​668

Changes

• attr.define() et al now correctly detect __eq__ and __ne__.
  #​671

• attr.define() et al's hybrid behavior now also works correctly when arguments are passed.
  #​675

• It's possible to define custom __setattr__ methods on slotted classes again.
  #​681

• In 20.1.0 we introduced the inherited attribute on the attr.Attribute class to differentiate attributes that have been inherited and those that have been defined directly on the class.

  It has shown to be problematic to involve that attribute when comparing instances of attr.Attribute though, because when sub-classing, attributes from base classes are suddenly not equal to themselves in a super class.

  Therefore the inherited attribute will now be ignored when hashing and comparing instances of attr.Attribute.
  #​684

• zope.interface is now a "soft dependency" when running the test suite; if zope.interface is not installed when running the test suite, the interface-related tests will be automatically skipped.
  #​685

• The ergonomics of creating frozen classes using @define(frozen=True) and sub-classing frozen classes has been improved:
  you don't have to set on_setattr=None anymore.
  #​687

---

v20.1.0

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Backward-incompatible Changes

• Python 3.4 is not supported anymore.
  It has been unsupported by the Python core team for a while now, its PyPI downloads are negligible, and our CI provider removed it as a supported option.

  It's very unlikely that attrs will break under 3.4 anytime soon, which is why we do not block its installation on Python 3.4.
  But we don't test it anymore and will block it once someone reports breakage.
  #​608

Deprecations

• Less of a deprecation and more of a heads up: the next release of attrs will introduce an attrs namespace.
  That means that you'll finally be able to run import attrs with new functions that aren't cute abbreviations and that will carry better defaults.

  This should not break any of your code, because project-local packages have priority before installed ones.
  If this is a problem for you for some reason, please report it to our bug tracker and we'll figure something out.

  The old attr namespace isn't going anywhere and its defaults are not changing – this is a purely additive measure.
  Please check out the linked issue for more details.

  These new APIs have been added provisionally as part of #​666 so you can try them out today and provide feedback.
  Learn more in the API docs.
  #​408

Changes

• Added attr.resolve_types().
  It ensures that all forward-references and types in string form are resolved into concrete types.

  You need this only if you need concrete types at runtime.
  That means that if you only use types for static type checking, you do not need this function.
  #​288,
  #​302

• Added @attr.s(collect_by_mro=False) argument that if set to True fixes the collection of attributes from base classes.

  It's only necessary for certain cases of multiple-inheritance but is kept off for now for backward-compatibility reasons.
  It will be turned on by default in the future.

  As a side-effect, attr.Attribute now always has an inherited attribute indicating whether an attribute on a class was directly defined or inherited.
  #​428,
  #​635

• On Python 3, all generated methods now have a docstring explaining that they have been created by attrs.
  #​506

• It is now possible to prevent attrs from auto-generating the __setstate__ and __getstate__ methods that are required for pickling of slotted classes.

  Either pass @attr.s(getstate_setstate=False) or pass @attr.s(auto_detect=True) and implement them yourself:
  if attrs finds either of the two methods directly on the decorated class, it assumes implicitly getstate_setstate=False (and implements neither).

  This option works with dict classes but should never be necessary.
  #​512,
  #​513,
  #​642

• Fixed a ValueError: Cell is empty bug that could happen in some rare edge cases.
  #​590

• attrs can now automatically detect your own implementations and infer init=False, repr=False, eq=False, order=False, and hash=False if you set @attr.s(auto_detect=True).
  attrs will ignore inherited methods.
  If the argument implies more than one method (for example, eq=True creates both __eq__ and __ne__), it's enough for one of them to exist and attrs will create neither.

  This feature requires Python 3.
  #​607

• Added attr.converters.pipe().
  The feature allows combining multiple conversion callbacks into one by piping the value through all of them, and retuning the last result.

  As part of this feature, we had to relax the type information for converter callables.
  #​618

• Fixed serialization behavior of non-slots classes with cache_hash=True.
  The hash cache will be cleared on operations which make "deep copies" of instances of classes with hash caching,
  though the cache will not be cleared with shallow copies like those made by copy.copy().

  Previously, copy.deepcopy() or serialization and deserialization with pickle would result in an un-initialized object.

  This change also allows the creation of cache_hash=True classes with a custom __setstate__,
  which was previously forbidden (#​494).
  #​620

• It is now possible to specify hooks that are called whenever an attribute is set after a class has been instantiated.

  You can pass on_setattr both to @attr.s() to set the default for all attributes on a class, and to @attr.ib() to overwrite it for individual attributes.

  attrs also comes with a new module attr.setters that brings helpers that run validators, converters, or allow to freeze a subset of attributes.
  #​645,
  #​660

• Provisional APIs called attr.define(), attr.mutable(), and attr.frozen() have been added.

  They are only available on Python 3.6 and later, and call attr.s() with different default values.

  If nothing comes up, they will become the official way for creating classes in 20.2.0 (see above).

  Please note that it may take some time until mypy – and other tools that have dedicated support for attrs – recognize these new APIs.
  Please do not open issues on our bug tracker, there is nothing we can do about it.
  #​666

• We have also provisionally added attr.field() that supplants attr.ib().
  It also requires at least Python 3.6 and is keyword-only.
  Other than that, it only dropped a few arguments, but changed no defaults.

  As with attr.s(): attr.ib() is not going anywhere.
  #​669

---

v19.3.0

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Changes

• Fixed auto_attribs usage when default values cannot be compared directly with ==, such as numpy arrays.
  #​585

---

v19.2.0

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Backward-incompatible Changes

• Removed deprecated Attribute attribute convert per scheduled removal on 2019/1.
  This planned deprecation is tracked in issue #​307.
  #​504

• __lt__, __le__, __gt__, and __ge__ do not consider subclasses comparable anymore.

  This has been deprecated since 18.2.0 and was raising a DeprecationWarning for over a year.
  #​570

Deprecations

• The cmp argument to attr.s() and attr.ib() is now deprecated.

  Please use eq to add equality methods (__eq__ and __ne__) and order to add ordering methods (__lt__, __le__, __gt__, and __ge__) instead – just like with dataclasses.

  Both are effectively True by default but it's enough to set eq=False to disable both at once.
  Passing eq=False, order=True explicitly will raise a ValueError though.

  Since this is arguably a deeper backward-compatibility break, it will have an extended deprecation period until 2021-06-01.
  After that day, the cmp argument will be removed.

  attr.Attribute also isn't orderable anymore.
  #​574

Changes

• Updated attr.validators.__all__ to include new validators added in [#​425].
  #​517
• Slotted classes now use a pure Python mechanism to rewrite the __class__ cell when rebuilding the class, so super() works even on environments where ctypes is not installed.
  #​522
• When collecting attributes using @attr.s(auto_attribs=True), attributes with a default of None are now deleted too.
  #​523,
  #​556
• Fixed attr.validators.deep_iterable() and attr.validators.deep_mapping() type stubs.
  #​533
• attr.validators.is_callable() validator now raises an exception attr.exceptions.NotCallableError, a subclass of TypeError, informing the received value.
  #​536
• @attr.s(auto_exc=True) now generates classes that are hashable by ID, as the documentation always claimed it would.
  #​543,
  #​563
• Added attr.validators.matches_re() that checks string attributes whether they match a regular expression.
  #​552
• Keyword-only attributes (kw_only=True) and attributes that are excluded from the attrs's __init__ (init=False) now can appear before mandatory attributes.
  #​559
• The fake filename for generated methods is now more stable.
  It won't change when you restart the process.
  #​560
• The value passed to @attr.ib(repr=…) can now be either a boolean (as before) or a callable.
  That callable must return a string and is then used for formatting the attribute by the generated __repr__() method.
  #​568
• Added attr.__version_info__ that can be used to reliably check the version of attrs and write forward- and backward-compatible code.
  Please check out the section on deprecated APIs on how to use it.
  #​580

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v19.1.0

Compare Source

Backward-incompatible Changes

• Fixed a bug where deserialized objects with cache_hash=True could have incorrect hash code values.
  This change breaks classes with cache_hash=True when a custom __setstate__ is present.
  An exception will be thrown when applying the attrs annotation to such a class.
  This limitation is tracked in issue #​494.
  #​482

Changes

• Add is_callable, deep_iterable, and deep_mapping validators.

  • is_callable: validates that a value is callable
  • deep_iterable: Allows recursion down into an iterable,
    applying another validator to every member in the iterable
    as well as applying an optional validator to the iterable itself.
  • deep_mapping: Allows recursion down into the items in a mapping object,
    applying a key validator and a value validator to the key and value in every item.
    Also applies an optional validator to the mapping object itself.

  You can find them in the attr.validators package.
  [#​425]

• Fixed stub files to prevent errors raised by mypy's disallow_any_generics = True option.
  #​443

• Attributes with init=False now can follow after kw_only=True attributes.
  #​450

• attrs now has first class support for defining exception classes.

  If you define a class using @attr.s(auto_exc=True) and subclass an exception, the class will behave like a well-behaved exception class including an appropriate __str__ method, and all attributes additionally available in an args attribute.
  #​500

• Clarified documentation for hashing to warn that hashable objects should be deeply immutable (in their usage, even if this is not enforced).
  #​503

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