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        "author": "Gerald Klix",
        "author_email": "gf@klix.ch",
        "bugtrack_url": null,
        "classifiers": [
            "Development Status :: 5 - Production/Stable",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: Python Software Foundation License",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 2.5",
            "Programming Language :: Python :: 2.7",
            "Programming Language :: Python :: 2 :: Only",
            "Programming Language :: Python :: Implementation",
            "Topic :: Software Development :: Libraries"
        ],
        "description": "===============================\nGF: Lisp-Like generic Functions\n===============================\n\nOverview\n========\n\n`gf` lets you write generic functions\n`generic functions <http://en.wikipedia.org/wiki/Generic_function>`_\nwith multi-methods, that dispatch on all their arguments.\n\n\nSimple Example\n--------------\n\n>>> from gf import generic, method\n>>> add = generic()\n>>> type(add)\n<type 'function'>\n\nLets define `add` for two integers:\n\n>>> @method(int, int)\n... def add(n0, n1):\n...     return n0 + n1\n\nLets test it:\n\n>>> add(1, 2)\n3\n\nCalling `add` with instances of other types fails:\n\n>>> add(\"Hello \", \"World\")\nTraceback (most recent call last):\n...\nNotImplementedError: Generic '__main__.add' has no implementation for type(s): __builtin__.str, __builtin__.str\n\nOf course `add` can also by defined for two strings:\n\n>>> @method(basestring, basestring)\n... def add(s0, s1):\n...     return s0 + s1\n\nNow our hello world example works:\n\n>>> add(\"Hello \", \"World\")\n'Hello World'\n\n`add` can also be defined for a string and an integer:\n\n>>> @method(basestring, int)\n... def add(s, n):\n...     return s + str(n)\n\nThus we can add a string and a number:\n\n>>> add(\"You \", 2)\n'You 2'\n\nPython's Special Methods\n------------------------\n\n`gf.Object` implements (nearly) all of the `special instance\nmethods of a python object`_ as a generic function.\nThe package includes a rational number implementation that makes\nheavy use of this feature:\n\n.. code:: python\n\n    @method(object, Rational)\n    def __add__(a, b):\n        \"\"\"Add an object and a rational number.\n        \n        `a` is converted to a `Rational` and then both are added.\"\"\"\n        return Rational(a) + b\n\n    @method(Rational, object)\n    def __add__(a, b):\n        \"\"\"Add a rational number and an object.\n\n        `b` is converted to a `Rational` and then both are added.\"\"\"\n        return a + Rational(b)\n\n`gf.Object` also has a more Smalltalk means of overwriting\n`object.__str__` and `object.__repr__` using a file like object.\nAgain the rational example is instructive about its usage.\n\n.. code:: python\n\n    @method(Rational, Writer)\n    def __out__(rational, writer):\n        \"\"\"Write a nice representation of the rational.\n        \n        Denominators that equal 1 are not printed.\"\"\"\n        writer(\"%d\", rational.numerator)\n        if rational.denominator != 1:\n            writer(\" / %d\", rational.denominator)\n\n    @method(Rational, Writer)\n    def __spy__(rational, writer):\n        \"\"\"Write a debug representation of the rational.\"\"\"\n        writer(\"%s(\", rational.__class__.__name__)\n        if rational.numerator != 0:\n                writer(\"%r\", rational.numerator)\n                if rational.denominator != 1:\n                    writer(\", %r\", rational.denominator)\n        writer(\")\")\n\n.. _special instance methods of a python object:\n   http://docs.python.org/2/reference/datamodel.html#special-method-names\n\nChanges\n-------\n\nA short sketch of the changes done in each release.\n\nRelease 0.1.4\n~~~~~~~~~~~~~\n\nThe following was fixed in Release 0.1.4:\n\n  * Fixed an issue with variadic methods. Sometimes definitions\n    of variadic methods added after the method was already called\n    where not added.\n  * Specified and implemented a precedence rule for overlapping\n    variadic methods of generic functions.\n  * Improved generated documentation for variadic methods.\n  * Fixed the markup of some notes in the documentation.\n\nRelease 0.1.3\n~~~~~~~~~~~~~\n\nThe following was changed in Release 0.1.3:\n\n  * Added variadic methods, e.g. multi-methods with a\n    variable number of arguments.\n  * Improved the long description text a bit\n    and fixed bug in its markup.\n  * Fixed invalid references in the long description.\n\nRelease 0.1.2\n~~~~~~~~~~~~~\n\nThe following was changed in Release 0.1.2:\n\n  * Added a generic functions for `gf.Object.__call__`.\n  * Added a `gf.go.FinalizingMixin`.\n  * `gf.generic` now also accepts a type.\n  * Improved the exception information for ambiguous calls.\n  * Fixed some documentation glitches.\n\nRelease 0.1.1\n~~~~~~~~~~~~~\n\nThis was the initial release.\n\nAcknowledgements\n================\nGuido van Rossum created the core of this package. I just renamed some things\nand added some convenience stuff. Thank you Guido!\n\nCopyright\n=========\n\u00a9 2006 Python Software Foundation.\n\u00a9 2006-2013 Gerald Klix.",
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