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        "author": "Chris Gearhart",
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        "description": "Chessnut\n========\n\n**Chessnut** is a simple chess board model written in Python.\n**Chessnut** is *not* a chess engine -- it has no AI to play games, and\nit has no GUI. It is a simple package that can import/export games in\n`Forsyth-Edwards\nNotation <http://en.wikipedia.org/wiki/Forsyth%E2%80%93Edwards_Notation>`__\n(FEN), generate a list of legal moves for the current board position,\nintelligently validate & apply moves (including *en passant*,\n*castling*, etc.), and keep track of the game with a history of both\nmoves and corresponding FEN representation.\n\n**Chessnut** is not written for speed, it is written for simplicity\n(there are only two real classes, and only about 200 lines of code). By\nadding a custom move evaluation function, **Chessnut** could be used as\na chess engine. The simplicity of the model lends itself well to\nstudying the construction of a chess engine without worrying about\nimplementing a chess model, or to easily find the set of legal moves for\neither player on a particular chess board for use in conjunction with\nanother chess application.\n\nInstallation\n------------\n\nVirualenv\n~~~~~~~~~\n\n**Chessnut** can be used as a module within your project or it can be\ninstalled on your system as a package. If you're going to install it as\na package, you should consider using\n`Virtualenv <http://www.virtualenv.org/en/latest/>`__ to manage your\npython environment. With virtualenv installed, creating a new project\nenvironment is easy. From your terminal shell:\n\n::\n\n    ~$ mkdir ~/project\n    ~/$ cd project\n    ~/project$ virtualenv env\n    ~/project$ source env/bin/activate\n    (env):~/project$\n\nFrom here you can use ``pip`` or ``setup.py`` to install the package and\nit will be restricted to the copy of python in the ``env`` directory.\nYou can leave the virtual environment by typing ``deactivate`` in the\nterminal, and restart the environment with ``source env/bin/activate``.\n\nPIP\n~~~\n\n``pip`` is the easiest way to install **Chessnut**. It can be installed\ndirectly from the `pypi <https://pypi.python.org/>`__\n`package <https://pypi.python.org/pypi/Chessnut>`__:\n\n``pip install Chessnut``\n\nUpgrading to the latest version can be performed with the ``-U`` flag:\n\n``pip install -U Chessnut``\n\nOr from the `github <https://github.com/>`__\n`repository <https://github.com/cgearhart/Chessnut.git>`__:\n\n``pip install git+https://github.com/cgearhart/Chessnut.git``\n\nSetup.py\n~~~~~~~~\n\nIf you prefer, you can install **Chessnut** manually with ``setup.py``.\nAfter downloading the source files to a local directory (and setting up\na ``virtualenv``), switch into the project directory and run\n``setup.py``:\n\n``python -m setup.py install``\n\n(Note: To install the package globally you may have to use the ``sudo``\ncommand.)\n\nAs a Module\n~~~~~~~~~~~\n\nFinally, **Chessnut** is also a standalone module, so if you place the\n``Chessnut`` directory within your project folder, you don't need to\ninstall the package, you can just import the module as usual. (Using one\nof the package versions--particularly PIP--is still recommended as a way\nto create separation between your code and the **Chessnut** package, so\nthat you don't have to worry about merging your changes into future\nupgrades of **Chessnut**.\n\n::\n\n    from Chessnut import Game\n\n    ...\n\n    *<your code>*\n\nTesting\n-------\n\nUnit tests can be run with the ``test.sh`` shell script which launches\nthe ```coverage.py`` <http://nedbatchelder.com/code/coverage/>`__\nframework as configured in ``.coveragerc``, or you can use the standard\n`unittest <http://docs.python.org/2/library/unittest.html>`__ framework\nvia ``python -m unittest discover``. If you install the ``pylint``\npackage, you can run the checker with default options using\n``pylint --ignore=tests Chessnut``.\n\nUsing Chessnut\n--------------\n\nThere are only two real classes in the **Chessnut** package: ``Board``\nand ``Game``. (There is also a\n`namedtuple <http://docs.python.org/2/library/collections.html#collections.namedtuple>`__,\n``State``, which creates a class, and another class, ``InvalidMove``--a\nsubclass of ``Exception``, used to avoid generic try/except statements).\n``Board`` is only used internally by ``Game`` to keep track of pieces\nand perform string formatting to and from FEN notation, so ``Game``\nshould be the only class you need to import. After installing the\nChessnut package, you can import and use it as you would expect:\n\n::\n\n    from Chessnut import Game\n\n    chessgame = Game()\n    print(chessgame)  # 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1'\n\n    print(chessgame.get_moves())\n    \"\"\"\n    ['a2a3', 'a2a4', 'b2b3', 'b2b4', 'c2c3', 'c2c4', 'd2d3', 'd2d4', 'e2e3', \n     'e2e4', 'f2f3', 'f2f4', 'g2g3', 'g2g4', 'h2h3', 'h2h4', 'b1c3', 'b1a3', \n     'g1h3', 'g1f3']\n    \"\"\"\n\n    chessgame.apply_move('e2e4')  # succeeds!\n    print(chessgame)  # 'rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1'\n\n    chessgame.apply_move('e2e4')  # fails! (raises InvalidMove exception)",
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