99 lines
3.3 KiB
ReStructuredText
99 lines
3.3 KiB
ReStructuredText
=====================================
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attrs: Attributes Without Boilerplate
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=====================================
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.. image:: https://readthedocs.org/projects/attrs/badge/?version=stable
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:target: http://attrs.readthedocs.io/en/stable/?badge=stable
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:alt: Documentation Status
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.. image:: https://travis-ci.org/hynek/attrs.svg?branch=master
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:target: https://travis-ci.org/hynek/attrs
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:alt: CI status
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.. image:: https://codecov.io/github/hynek/attrs/branch/master/graph/badge.svg
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:target: https://codecov.io/github/hynek/attrs
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:alt: Test Coverage
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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 <http://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 C(object):
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... x = attr.ib(default=42)
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... y = attr.ib(default=attr.Factory(list))
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...
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... def hard_math(self, z):
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... return self.x * self.y * z
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>>> i = C(x=1, y=2)
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>>> i
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C(x=1, y=2)
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>>> i.hard_math(3)
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6
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>>> i == C(1, 2)
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True
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>>> i != C(2, 1)
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True
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>>> attr.asdict(i)
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{'y': 2, 'x': 1}
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>>> C()
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C(x=42, y=[])
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>>> C2 = attr.make_class("C2", ["a", "b"])
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>>> C2("foo", "bar")
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C2(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,
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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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This gives you the power to use actual classes with actual types in your code instead of confusing ``tuple``\ s or confusingly behaving ``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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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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-- Glyph Lefkowitz, inventor of Twisted and Software Developer at Rackspace in `The One Python Library Everyone Needs <https://glyph.twistedmatrix.com/2016/08/attrs.html>`_
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I'm increasingly digging your attr.ocity. Good job!
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-- Łukasz Langa, prolific CPython core developer and Production Engineer at Facebook
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.. -end-
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.. -project-information-
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Project Information
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===================
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``attrs`` is released under the `MIT <http://choosealicense.com/licenses/mit/>`_ license,
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its documentation lives at `Read the Docs <https://attrs.readthedocs.io/>`_,
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the code on `GitHub <https://github.com/hynek/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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