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        "author": "Brandon T. Willard",
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            "Development Status :: 3 - Alpha",
            "Intended Audience :: Developers",
            "Intended Audience :: Science/Research",
            "License :: DFSG approved",
            "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
            "Operating System :: OS Independent",
            "Programming Language :: Python",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.5",
            "Programming Language :: Python :: 3.6",
            "Programming Language :: Python :: 3.7",
            "Programming Language :: Python :: Implementation :: CPython",
            "Programming Language :: Python :: Implementation :: PyPy",
            "Topic :: Software Development :: Libraries"
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        "description": "[![Build Status](https://travis-ci.org/brandonwillard/python-cons.svg?branch=master)](https://travis-ci.org/brandonwillard/python-cons) [![Coverage Status](https://coveralls.io/repos/github/brandonwillard/python-cons/badge.svg?branch=master)](https://coveralls.io/github/brandonwillard/python-cons?branch=master) [![PyPI](https://img.shields.io/pypi/v/cons)](https://pypi.org/project/cons/)\n\nPython `cons`\n==================\n\nAn implementation of [`cons`][cons] in Python.\n\nUsage and Design\n======================\n\nThe `cons` package attempts to emulate the semantics of Lisp/Scheme's `cons` as closely as possible while incorporating all the built-in Python sequence types:\n```python\n>>> from cons import cons, car, cdr\n>>> cons(1, [])\n[1]\n\n>>> cons(1, ())\n(1,)\n\n>>> cons(1, [2, 3])\n[1, 2, 3]\n```\n\nIn general, `cons` is designed to work with `collections.abc.Sequence` types.\n\nAccording to the `cons` package, `None` corresponds to the empty built-in `list`, as `nil` does in some Lisps:\n```python\n>>> cons(1, None)\n[1]\n```\n\nThe `cons` package follows Scheme-like semantics for empty sequences:\n```python\n>>> car([])\nTraceback (most recent call last):\n  File \"<stdin>\", line 1, in <module>\nConsError: Not a cons pair\n\n>>> cdr([])\nTraceback (most recent call last):\n  File \"<stdin>\", line 1, in <module>\nConsError: Not a cons pair\n\n```\n\nBy default, `str` types are not considered cons-pairs, although they are sequences:\n```python\n>>> cons(\"a\", \"string\")\nConsPair('a' 'a string')\n```\n\nThis setting can be overridden and other types can be similarly excluded from consideration by registering classes with the `abc`-based classes `MaybeCons` and `NonCons`.\n\n\nFeatures\n===========\n\n* Built-in support for the standard Python ordered sequence types: i.e. `list`, `tuple`, `Iterator`, `OrderedDict`.\n```python\n>>> from collections import OrderedDict\n>>> cons(('a', 1), OrderedDict())\nOrderedDict([('a', 1)])\n\n```\n* Existing `cons` behavior can be changed and support for new collections can be added through the generic functions `cons.core._car` and `cons.core._cdr`.\n* Built-in support for [`unification`][un].\n```python\n>>> from unification import unify, reify, var\n>>> unify([1, 2], cons(var('car'), var('cdr')), {})\n{~car: 1, ~cdr: [2]}\n\n>>> reify(cons(1, var('cdr')), {var('cdr'): [2, 3]})\n[1, 2, 3]\n\n>>> reify(cons(1, var('cdr')), {var('cdr'): None})\n[1]\n\n```\n\nInstallation\n================\n\n```python\npip install cons\n```\n\n\n[cons]: https://en.wikipedia.org/wiki/Cons\n[un]: https://github.com/mrocklin/unification\n\n\n",
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