17.12
This commit is contained in:
Mai Gillmann
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pip
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The MIT License (MIT)
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Copyright (c) 2015 Hynek Schlawack
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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Metadata-Version: 2.1
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Name: attrs
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Version: 19.3.0
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Summary: Classes Without Boilerplate
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Home-page: https://www.attrs.org/
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Author: Hynek Schlawack
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Author-email: hs@ox.cx
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Maintainer: Hynek Schlawack
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Maintainer-email: hs@ox.cx
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License: MIT
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Project-URL: Documentation, https://www.attrs.org/
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Project-URL: Bug Tracker, https://github.com/python-attrs/attrs/issues
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Project-URL: Source Code, https://github.com/python-attrs/attrs
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Keywords: class,attribute,boilerplate
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Platform: UNKNOWN
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Classifier: Development Status :: 5 - Production/Stable
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Classifier: Intended Audience :: Developers
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Classifier: Natural Language :: English
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Classifier: License :: OSI Approved :: MIT License
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Classifier: Operating System :: OS Independent
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Classifier: Programming Language :: Python
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Classifier: Programming Language :: Python :: 2
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Classifier: Programming Language :: Python :: 2.7
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Classifier: Programming Language :: Python :: 3
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Classifier: Programming Language :: Python :: 3.4
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Classifier: Programming Language :: Python :: 3.5
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Classifier: Programming Language :: Python :: 3.6
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Classifier: Programming Language :: Python :: 3.7
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Classifier: Programming Language :: Python :: 3.8
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Classifier: Programming Language :: Python :: Implementation :: CPython
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Classifier: Programming Language :: Python :: Implementation :: PyPy
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Classifier: Topic :: Software Development :: Libraries :: Python Modules
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Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*
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Description-Content-Type: text/x-rst
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Provides-Extra: azure-pipelines
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Requires-Dist: coverage ; extra == 'azure-pipelines'
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Requires-Dist: hypothesis ; extra == 'azure-pipelines'
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Requires-Dist: pympler ; extra == 'azure-pipelines'
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Requires-Dist: pytest (>=4.3.0) ; extra == 'azure-pipelines'
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Requires-Dist: six ; extra == 'azure-pipelines'
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Requires-Dist: zope.interface ; extra == 'azure-pipelines'
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Requires-Dist: pytest-azurepipelines ; extra == 'azure-pipelines'
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Provides-Extra: dev
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Requires-Dist: coverage ; extra == 'dev'
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Requires-Dist: hypothesis ; extra == 'dev'
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Requires-Dist: pympler ; extra == 'dev'
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Requires-Dist: pytest (>=4.3.0) ; extra == 'dev'
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Requires-Dist: six ; extra == 'dev'
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Requires-Dist: zope.interface ; extra == 'dev'
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Requires-Dist: sphinx ; extra == 'dev'
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Requires-Dist: pre-commit ; extra == 'dev'
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Provides-Extra: docs
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Requires-Dist: sphinx ; extra == 'docs'
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Requires-Dist: zope.interface ; extra == 'docs'
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Provides-Extra: tests
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Requires-Dist: coverage ; extra == 'tests'
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Requires-Dist: hypothesis ; extra == 'tests'
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Requires-Dist: pympler ; extra == 'tests'
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Requires-Dist: pytest (>=4.3.0) ; extra == 'tests'
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Requires-Dist: six ; extra == 'tests'
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Requires-Dist: zope.interface ; extra == 'tests'
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.. image:: https://www.attrs.org/en/latest/_static/attrs_logo.png
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:alt: attrs Logo
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======================================
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``attrs``: Classes Without Boilerplate
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======================================
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.. image:: https://readthedocs.org/projects/attrs/badge/?version=stable
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:target: https://www.attrs.org/en/stable/?badge=stable
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:alt: Documentation Status
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.. image:: https://attrs.visualstudio.com/attrs/_apis/build/status/python-attrs.attrs?branchName=master
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:target: https://attrs.visualstudio.com/attrs/_build/latest?definitionId=1&branchName=master
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:alt: CI Status
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.. image:: https://codecov.io/github/python-attrs/attrs/branch/master/graph/badge.svg
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:target: https://codecov.io/github/python-attrs/attrs
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:alt: Test Coverage
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.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
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:target: https://github.com/psf/black
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:alt: Code style: black
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.. teaser-begin
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``attrs`` is the Python package that will bring back the **joy** of **writing classes** by relieving you from the drudgery of implementing object protocols (aka `dunder <https://nedbatchelder.com/blog/200605/dunder.html>`_ methods).
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Its main goal is to help you to write **concise** and **correct** software without slowing down your code.
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.. -spiel-end-
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For that, it gives you a class decorator and a way to declaratively define the attributes on that class:
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.. -code-begin-
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.. code-block:: pycon
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>>> import attr
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>>> @attr.s
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... class SomeClass(object):
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... a_number = attr.ib(default=42)
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... list_of_numbers = attr.ib(factory=list)
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...
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... def hard_math(self, another_number):
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... return self.a_number + sum(self.list_of_numbers) * another_number
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>>> sc = SomeClass(1, [1, 2, 3])
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>>> sc
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SomeClass(a_number=1, list_of_numbers=[1, 2, 3])
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>>> sc.hard_math(3)
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19
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>>> sc == SomeClass(1, [1, 2, 3])
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True
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>>> sc != SomeClass(2, [3, 2, 1])
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True
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>>> attr.asdict(sc)
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{'a_number': 1, 'list_of_numbers': [1, 2, 3]}
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>>> SomeClass()
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SomeClass(a_number=42, list_of_numbers=[])
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>>> C = attr.make_class("C", ["a", "b"])
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>>> C("foo", "bar")
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C(a='foo', b='bar')
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After *declaring* your attributes ``attrs`` gives you:
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- a concise and explicit overview of the class's attributes,
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- a nice human-readable ``__repr__``,
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- a complete set of comparison methods (equality and ordering),
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- an initializer,
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- and much more,
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*without* writing dull boilerplate code again and again and *without* runtime performance penalties.
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On Python 3.6 and later, you can often even drop the calls to ``attr.ib()`` by using `type annotations <https://www.attrs.org/en/latest/types.html>`_.
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This gives you the power to use actual classes with actual types in your code instead of confusing ``tuple``\ s or `confusingly behaving <https://www.attrs.org/en/stable/why.html#namedtuples>`_ ``namedtuple``\ s.
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Which in turn encourages you to write *small classes* that do `one thing well <https://www.destroyallsoftware.com/talks/boundaries>`_.
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Never again violate the `single responsibility principle <https://en.wikipedia.org/wiki/Single_responsibility_principle>`_ just because implementing ``__init__`` et al is a painful drag.
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.. -testimonials-
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Testimonials
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============
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**Amber Hawkie Brown**, Twisted Release Manager and Computer Owl:
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Writing a fully-functional class using attrs takes me less time than writing this testimonial.
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**Glyph Lefkowitz**, creator of `Twisted <https://twistedmatrix.com/>`_, `Automat <https://pypi.org/project/Automat/>`_, and other open source software, in `The One Python Library Everyone Needs <https://glyph.twistedmatrix.com/2016/08/attrs.html>`_:
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I’m looking forward to is being able to program in Python-with-attrs everywhere.
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It exerts a subtle, but positive, design influence in all the codebases I’ve see it used in.
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**Kenneth Reitz**, creator of `Requests <https://github.com/psf/requests>`_ (`on paper no less <https://twitter.com/hynek/status/866817877650751488>`_!):
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attrs—classes for humans. I like it.
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**Łukasz Langa**, creator of `Black <https://github.com/psf/black>`_, prolific Python core developer, and release manager for Python 3.8 and 3.9:
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I'm increasingly digging your attr.ocity. Good job!
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.. -end-
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.. -project-information-
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Getting Help
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============
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Please use the ``python-attrs`` tag on `StackOverflow <https://stackoverflow.com/questions/tagged/python-attrs>`_ to get help.
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Answering questions of your fellow developers is also great way to help the project!
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Project Information
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===================
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``attrs`` is released under the `MIT <https://choosealicense.com/licenses/mit/>`_ license,
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its documentation lives at `Read the Docs <https://www.attrs.org/>`_,
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the code on `GitHub <https://github.com/python-attrs/attrs>`_,
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and the latest release on `PyPI <https://pypi.org/project/attrs/>`_.
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It’s rigorously tested on Python 2.7, 3.4+, and PyPy.
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We collect information on **third-party extensions** in our `wiki <https://github.com/python-attrs/attrs/wiki/Extensions-to-attrs>`_.
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Feel free to browse and add your own!
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If you'd like to contribute to ``attrs`` you're most welcome and we've written `a little guide <https://www.attrs.org/en/latest/contributing.html>`_ to get you started!
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Release Information
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===================
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19.3.0 (2019-10-15)
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-------------------
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Changes
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^^^^^^^
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- Fixed ``auto_attribs`` usage when default values cannot be compared directly with ``==``, such as ``numpy`` arrays.
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`#585 <https://github.com/python-attrs/attrs/issues/585>`_
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`Full changelog <https://www.attrs.org/en/stable/changelog.html>`_.
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Credits
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=======
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``attrs`` is written and maintained by `Hynek Schlawack <https://hynek.me/>`_.
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The development is kindly supported by `Variomedia AG <https://www.variomedia.de/>`_.
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A full list of contributors can be found in `GitHub's overview <https://github.com/python-attrs/attrs/graphs/contributors>`_.
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It’s the spiritual successor of `characteristic <https://characteristic.readthedocs.io/>`_ and aspires to fix some of it clunkiness and unfortunate decisions.
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Both were inspired by Twisted’s `FancyEqMixin <https://twistedmatrix.com/documents/current/api/twisted.python.util.FancyEqMixin.html>`_ but both are implemented using class decorators because `subclassing is bad for you <https://www.youtube.com/watch?v=3MNVP9-hglc>`_, m’kay?
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