Metadata-Version: 2.1 Name: attrs Version: 21.2.0 Summary: Classes Without Boilerplate Home-page: https://www.attrs.org/ Author: Hynek Schlawack Author-email: hs@ox.cx Maintainer: Hynek Schlawack Maintainer-email: hs@ox.cx License: MIT Project-URL: Documentation, https://www.attrs.org/ Project-URL: Changelog, https://www.attrs.org/en/stable/changelog.html Project-URL: Bug Tracker, https://github.com/python-attrs/attrs/issues Project-URL: Source Code, https://github.com/python-attrs/attrs Project-URL: Funding, https://github.com/sponsors/hynek Project-URL: Tidelift, https://tidelift.com/subscription/pkg/pypi-attrs?utm_source=pypi-attrs&utm_medium=pypi Project-URL: Ko-fi, https://ko-fi.com/the_hynek Keywords: class,attribute,boilerplate Platform: UNKNOWN Classifier: Development Status :: 5 - Production/Stable Classifier: Intended Audience :: Developers Classifier: Natural Language :: English Classifier: License :: OSI Approved :: MIT License Classifier: Operating System :: OS Independent Classifier: Programming Language :: Python Classifier: Programming Language :: Python :: 2 Classifier: Programming Language :: Python :: 2.7 Classifier: Programming Language :: Python :: 3 Classifier: Programming Language :: Python :: 3.5 Classifier: Programming Language :: Python :: 3.6 Classifier: Programming Language :: Python :: 3.7 Classifier: Programming Language :: Python :: 3.8 Classifier: Programming Language :: Python :: 3.9 Classifier: Programming Language :: Python :: 3.10 Classifier: Programming Language :: Python :: Implementation :: CPython Classifier: Programming Language :: Python :: Implementation :: PyPy Classifier: Topic :: Software Development :: Libraries :: Python Modules Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.* Description-Content-Type: text/x-rst Provides-Extra: docs Provides-Extra: tests_no_zope Provides-Extra: tests Provides-Extra: dev License-File: LICENSE License-File: AUTHORS.rst ====================================== ``attrs``: Classes Without Boilerplate ====================================== ``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). `Trusted by NASA <https://docs.github.com/en/github/setting-up-and-managing-your-github-profile/personalizing-your-profile#list-of-qualifying-repositories-for-mars-2020-helicopter-contributor-badge>`_ for Mars missions since 2020! Its main goal is to help you to write **concise** and **correct** software without slowing down your code. .. teaser-end For that, it gives you a class decorator and a way to declaratively define the attributes on that class: .. -code-begin- .. code-block:: pycon >>> import attr >>> @attr.s ... class SomeClass(object): ... a_number = attr.ib(default=42) ... list_of_numbers = attr.ib(factory=list) ... ... def hard_math(self, another_number): ... return self.a_number + sum(self.list_of_numbers) * another_number >>> sc = SomeClass(1, [1, 2, 3]) >>> sc SomeClass(a_number=1, list_of_numbers=[1, 2, 3]) >>> sc.hard_math(3) 19 >>> sc == SomeClass(1, [1, 2, 3]) True >>> sc != SomeClass(2, [3, 2, 1]) True >>> attr.asdict(sc) {'a_number': 1, 'list_of_numbers': [1, 2, 3]} >>> SomeClass() SomeClass(a_number=42, list_of_numbers=[]) >>> C = attr.make_class("C", ["a", "b"]) >>> C("foo", "bar") C(a='foo', b='bar') After *declaring* your attributes ``attrs`` gives you: - a concise and explicit overview of the class's attributes, - a nice human-readable ``__repr__``, - a complete set of comparison methods (equality and ordering), - an initializer, - and much more, *without* writing dull boilerplate code again and again and *without* runtime performance penalties. 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>`_. 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. Which in turn encourages you to write *small classes* that do `one thing well <https://www.destroyallsoftware.com/talks/boundaries>`_. 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. .. -getting-help- Getting Help ============ Please use the ``python-attrs`` tag on `StackOverflow <https://stackoverflow.com/questions/tagged/python-attrs>`_ to get help. Answering questions of your fellow developers is also a great way to help the project! .. -project-information- Project Information =================== ``attrs`` is released under the `MIT <https://choosealicense.com/licenses/mit/>`_ license, its documentation lives at `Read the Docs <https://www.attrs.org/>`_, the code on `GitHub <https://github.com/python-attrs/attrs>`_, and the latest release on `PyPI <https://pypi.org/project/attrs/>`_. It’s rigorously tested on Python 2.7, 3.5+, and PyPy. We collect information on **third-party extensions** in our `wiki <https://github.com/python-attrs/attrs/wiki/Extensions-to-attrs>`_. Feel free to browse and add your own! 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! ``attrs`` for Enterprise ------------------------ Available as part of the Tidelift Subscription. The maintainers of ``attrs`` and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source packages you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact packages you use. `Learn more. <https://tidelift.com/subscription/pkg/pypi-attrs?utm_source=pypi-attrs&utm_medium=referral&utm_campaign=enterprise&utm_term=repo>`_ Release Information =================== 21.2.0 (2021-05-07) ------------------- Backward-incompatible Changes ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - We had to revert the recursive feature for ``attr.evolve()`` because it broke some use-cases -- sorry! `#806 <https://github.com/python-attrs/attrs/issues/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 <https://pypi.org/help/#yanked>`_ 21.1.0 from PyPI. This has **no** consequences if you pin ``attrs`` to 21.1.0. `#807 <https://github.com/python-attrs/attrs/issues/807>`_ `Full changelog <https://www.attrs.org/en/stable/changelog.html>`_. Credits ======= ``attrs`` is written and maintained by `Hynek Schlawack <https://hynek.me/>`_. The development is kindly supported by `Variomedia AG <https://www.variomedia.de/>`_. A full list of contributors can be found in `GitHub's overview <https://github.com/python-attrs/attrs/graphs/contributors>`_. It’s the spiritual successor of `characteristic <https://characteristic.readthedocs.io/>`_ and aspires to fix some of it clunkiness and unfortunate decisions. 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?