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    "info": {
        "author": "thautwarm",
        "author_email": "twshere@outlook.com",
        "bugtrack_url": null,
        "classifiers": [
            "Programming Language :: Python :: 3.6",
            "Programming Language :: Python :: 3.7",
            "Programming Language :: Python :: Implementation :: CPython"
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        "description": "|License| |PyPI version|\n\nTail call optimization(TCO) has been removed from this package for\nfollowing reasons:\n\n1. TCO is easy to implement.\n2. Guaranteeing TCO dynamically in any situations is really expensive.\n\nIf you do want to use TCO in Python, check\nhttps://zhuanlan.zhihu.com/p/42684997.\n\nThe documents have been migrated to README now:\n\nDocs\n----\n\nThese are all you need to import.\n\n.. code:: python\n\n    from pattern_matching import var, _, T, t, when, Match, overwrite\n\nType Matching\n-------------\n\n.. code:: python\n\n\n    @when(var[T == int])\n    # T means the type would be capture.\n    def f(v, type_of_v):\n        print(v, type_of_v)\n\n    f(1)\n    # => (1, int)\n\nRemark: Using ``Match`` is similar to ``when/overwrite``:\n\n.. code:: python\n\n    m = Match(1)\n    res = m.case(var[T == int])\n    if res:\n        [a, b] = res.get\n        assert [a, b] == [1, int]\n\nIf the pattern matched, ``Match.case`` returns a ``Result`` object.\n\n.. code:: python\n\n    class Result:\n        __slots__ = 'get'\n\n        def __init__(self, _):\n            self.get = _\n\nOtherwise the return is ``None``.\n\nValue Matching\n--------------\n\n.. code:: python\n\n    @when(_ == 1)\n    def f():\n        return 12\n\n    @when(_ == 2)\n    def f():\n        return 0\n\n    @when(var)\n    def f(arg):\n        return arg ** 3\n\n    f(1), f(2), f(3) # => 12, 0, 27\n\nWildcard for types\n------------------\n\n.. code:: python\n\n    @when(var[t == float])\n    # the lowercase, \"t\", which indicates that the type just be matched without capture.\n    def f(v):\n        print(v)\n    f(1.0)\n    # => 1.0\n\nWildcard for values\n-------------------\n\n.. code:: python\n\n    @when(_)\n    def f():\n        return 1\n    f(1) == f(\"...\") == f(1e-3)\n    # => True\n\nType Boundary\n-------------\n\n.. code:: python\n\n    class MyList(list):\n        pass\n    from collections import Iterable\n\n    @when(var[Iterable <= T <= MyList]\n        .when(lambda x: 1 in x)\n    )\n    def f(x, T):\n        return (x, T)\n\n    f([1, 2, 3])\n    # => ([1, 2, 3], list)\n\n    f({1, 2, 3})\n    # => UnsolvedCase: No entry for args<({1, 2, 3},)>, kwargs:<{}>\n\nOverloading functions\n---------------------\n\nOverloading functions are introduced through the following simple cases:\n\n.. code:: python\n\n    @overwrite(_ == [])\n    def summary():\n        return 0\n\n    @when([var[int], *(_== [])])\n    def summary(head):\n        return head\n\n    @when([var[int], *var[list]])\n    def summary(head, tail):\n        return head + summary(tail)\n\n    summary([1, 2, 3])\n    # => 6\n\nNote that above code is definitely useless for it doesn't use tail call\noptimization.\n\nUnion Type\n----------\n\n.. code:: python\n\n    @when(var[(t == int) | (t == str)])\n    def disp(x):\n        print(x)\n    disp(1) # => 1\n    disp('1') # => '1'\n\nIntersection Type\n-----------------\n\n.. code:: python\n\n    class A:\n        pass\n    class B:\n        pass\n    class C(A, B):\n        pass\n\n    @when(_[(T == A) | (T == B)])\n    def disp(ty):\n        print(ty)\n    disp(C()) # => <class __main__.C>\n\nDifference Type\n---------------\n\n.. code:: python\n\n    class A:\n        pass\n    class B:\n        pass\n    class C(A, B):\n        pass\n\n    @when(_[T != A])\n    def disp(ty):\n        print(ty)\n    disp(C()) # => <class __main__.C>\n    disp(B()) # => <class __main__.B>\n\n    disp(A())\n    # => UnsolvedCase: No entry for args<(<__main__.A object at ...>,)>, kwargs:<{}>\n\nType Contracts\n--------------\n\nYou can apply ``.when(predicate)`` methods on ``pattern_matching.T/t`` .\n\nTo avoid subclassing.\n\n.. code:: python\n\n    class A:\n        pass\n    class B:\n        pass\n    class C(A, B):\n        pass\n\n    @overwrite(_[T.when(lambda _: not issubclass(_, A))])\n    def disp(ty):\n        print(ty)\n    disp(C()) # => <class __main__.C>\n    # => UnsolvedCase: No entry for args<(<__main__.C object at ...>,)>, kwargs:<{}>\n\nMatch Argument Numbers\n----------------------\n\n.. code:: python\n\n\n    @when(var/2)\n    def f(g):\n        return g(1, 2)\n\n    f(lambda a, b: a + b) # => 3\n    f(lambda a, b, c: a + b)\n    # => UnsolvedCase: No entry for args<(<function <lambda> at ...>,)>, kwargs:<{}>\n\n    class F:\n        def apply(self, arg):\n            return arg + 1\n\n    @when(var/1)\n    def f2(g):\n        return g(1)\n\n\n    f2(lambda a, b: a + b)\n    # => UnsolvedCase: No entry for args<(<function <lambda> at ...>,)>, kwargs:<{}>\n    f2(F().apply) # => 2\n\n.. |License| image:: https://img.shields.io/badge/license-MIT-green.svg\n   :target: https://github.com/Xython/Destruct.py/blob/master/LICENSE\n.. |PyPI version| image:: https://img.shields.io/pypi/v/pattern-matching.svg\n   :target: https://pypi.python.org/pypi/pattern-matching\n",
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