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            "Programming Language :: Python :: 3.4",
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        "description": "Linq.py\n=======\n\n|Build Status| |License| |codecov| |Coverage Status| |PyPI version|\n\nInstall\n-------\n\n::\n\n    pip install -U Linq\n\nAdditional: Some magic here: `Mix Linq with\nPipe <https://github.com/Xython/Linq.py/blob/master/using_pipe.md>`__\n\nHere is an example to get top 10 frequent pixels in a picture.\n\n.. code:: python\n\n\n    from linq import Flow\n    import numpy as np\n\n    def most_frequent(arr: np.ndarray) -> np.ndarray:\n        return  Flow(arr.flatten())                     \\\n                        .GroupBy(lambda _: _)           \\\n                        .Then(lambda x: x.items())      \\\n                        .Map(lambda k, v: (k, len(v)))  \\\n                        .Sorted(by=lambda _, v: -v)     \\\n                        .Take(10)                       \\\n                        .Map(lambda k, _: k)            \\\n                        .ToList()                       \\\n                        .Then(np.array).Unboxed()\n\nAbout Linq\n----------\n\n| The well-known EDSL in .NET, ``Language Integrated Query``, in my\n  opinion, is one of the best design in .NET environment.\n| Here is an example of C# Linq.\n\n.. code:: c#\n\n    // Calculate MSE loss.\n    /// <param name=\"Prediction\"> the prediction of the neuron network</param>\n    /// <param name=\"Expected\"> the expected target of the neuron network</param>\n\n    Prediction.Zip(Expected, (pred, expected)=> Math.Square(pred-expected)).Average()\n\nIt's so human readable and it doesn't cost much.\n\n-  Reference:\n\n   -  Microsoft .NET general introduction => `LINQ: .NET\n      Language-Integrated\n      Query <https://msdn.microsoft.com/en-us/library/bb308959.aspx>`__.\n   -  Wikipedia => `Language Integrated\n      Query <https://en.wikipedia.org/wiki/Language_Integrated_Query>`__.\n\nAnd there are so many scenes very awkward to Python programmer, using\n``Linq`` might help a lot.\n\nAwkward Scenes in Python\n------------------------\n\n.. code:: python\n\n\n    seq1 = range(100)\n    seq2 = range(100, 200)\n    zipped = zip(seq1, seq2)\n    mapped = map(lambda ab: ab[0] / ab[1], zipped)\n    grouped = dict();\n    group_fn = lambda x: x // 0.2\n    for e in mapped:\n        group_id = group_fn(e)\n        if group_id not in grouped:\n            grouped[group_id] = [e]\n            continue\n        grouped[group_id].append(e)\n    for e in grouped.items():\n        print(e)\n\nThe codes seems to be too long...\n\nNow we extract the function ``group_by``:\n\n.. code:: python\n\n\n    def group_by(f, container):\n        grouped = dict()\n        for e in container:\n            group_id = f(e)\n            if group_id not in grouped:\n                grouped[group_id] = [e]\n                continue\n            grouped[group_id].append(e)\n        return grouped\n    res = group_by(lambda x: x//0.2, map(lambda ab[0]/ab[1], zip(seq1, seq2)))\n\nOkay, it's not at fault, however, it makes me upset \u2014\u2014 why do I have to\nwrite these ugly codes?\n\n**Now, let us try Linq!**\n\n.. code:: python\n\n\n    from linq import Flow, extension_std\n    seq = Flow(range(100))\n    res = seq.Zip(range(100, 200)).Map(lambda fst, snd : fst/snd).GroupBy(lambda num: num//0.2).Unboxed()\n\nHow does `Linq.py <https://github.com/Xython/Linq.py>`__ work?\n--------------------------------------------------------------\n\n| There is a core class object, ``linq.core.flow.Flow``, which just has\n  one member ``stream``.\n| When you want to get a specific extension method from ``Flow`` object,\n  the ``type`` of its ``stream`` member will be used to search whether\n  the extension method exists.\n| In other words, extension methods are binded with the type(precisely,\n  ``{type.__module__}.{type.__name__}``).\n\n.. code:: python\n\n\n    class Flow:\n        __slots__ = ['stream']\n\n        def __init__(self, sequence):\n            self.stream = sequence\n\n        def __getattr__(self, k):\n            for cls in self.stream.__class__.__mro__:\n                namespace = Extension['{}.{}'.format(cls.__module__, cls.__name__)]\n                if k in namespace:\n                    return partial(namespace[k], self)\n            raise NameError(\n                \"No extension method named `{}` for {}.\".format(\n                    k, '{}.{}'.format(object.__module__, object.__name__)))\n\n        def __str__(self):\n            return self.stream.__str__()\n\n        def __repr__(self):\n            return self.__str__()\n\nExtension Method\n----------------\n\nHere are three methods for you to do so.\n\n-  Firstly, you can use ``extension_std`` to add extension methods for\n   all Flow objects.\n\n-  Next, you use ``extension_class(cls: type)`` to add extension methods\n   for all Flow objects whose member ``stream``'s type is named\n   ``{cls.__module}.{cls.__name__}``.\n\n-  Finally, you can use\n   ``extension_class(cls_name: str,  of_module='builtins')`` to add\n   extension methods for all Flow objects whose member ``stream``'s type\n   is named is named ``{of_module}.{cls_name}``.\n\n(This way to make extension methods is for the **implicit types** in\nPython, each of which cannot be got except from its instances' meta\nmember ``__class__``.)\n\n.. code:: python\n\n\n    @extension_std  # For all Flow objects\n    def Add(self, i):\n        return Flow(self.stream + (i.stream if isinstance(i, Flow) else i)))\n\n    @extension_class(int) # Just for type `int`\n    def Add(self, i):\n        return Flow(self.stream + (i.stream if isinstance(i, Flow) else i)))\n\n    @extension_class_name('int',  of_module=int.__module__) # Also for type `int`.\n    def Add(self, i):\n        return Flow(self.stream + (i.stream if isinstance(i, Flow) else i)))\n\nDocuments of Standard Extension Methods\n---------------------------------------\n\nNote: Docs haven't been finished yet.\n\n-  General(can be used by all Flow objects)\n\n   -  `Unboxed <https://github.com/Xython/Linq.py/blob/master/docs/general.md#unboxed>`__\n   -  `Sum <https://github.com/Xython/Linq.py/blob/master/docs/general.md#sum>`__\n   -  `Enum <https://github.com/Xython/Linq.py/blob/master/docs/general.md#enum>`__\n   -  `Map <https://github.com/Xython/Linq.py/blob/master/docs/general.md#map>`__\n   -  `Reduce <https://github.com/Xython/Linq.py/blob/master/docs/general.md#reduce>`__\n   -  `Then <https://github.com/Xython/Linq.py/blob/master/docs/general.md#then>`__\n   -  `Each <https://github.com/Xython/Linq.py/blob/master/docs/general.md#each>`__\n   -  `Aggregate <https://github.com/Xython/Linq.py/blob/master/docs/general.md#aggregate>`__\n   -  `Zip <https://github.com/Xython/Linq.py/blob/master/docs/general.md#zip>`__\n   -  `Sorted <https://github.com/Xython/Linq.py/blob/master/docs/general.md#sorted>`__\n   -  `ArgSorted <https://github.com/Xython/Linq.py/blob/master/docs/general.md#argsorted>`__\n   -  `Group <https://github.com/Xython/Linq.py/blob/master/docs/general.md#group>`__\n   -  `GroupBy <https://github.com/Xython/Linq.py/blob/master/docs/general.md#groupby>`__\n   -  `Take <https://github.com/Xython/Linq.py/blob/master/docs/general.md#take>`__\n   -  `TakeWhile <https://github.com/Xython/Linq.py/blob/master/docs/general.md#takewhile>`__\n   -  `Drop\\|Skip <https://github.com/Xython/Linq.py/blob/master/docs/general.md#drop%7Cskip>`__\n   -  `Concat <https://github.com/Xython/Linq.py/blob/master/docs/general.md#concat>`__\n   -  `ToList <https://github.com/Xython/Linq.py/blob/master/docs/general.md#tolist>`__\n   -  `ToTuple <https://github.com/Xython/Linq.py/blob/master/docs/general.md#totuple>`__\n   -  `ToDict <https://github.com/Xython/Linq.py/blob/master/docs/general.md#todict>`__\n   -  `ToSet <https://github.com/Xython/Linq.py/blob/master/docs/general.md#toset>`__\n   -  `All <https://github.com/Xython/Linq.py/blob/master/docs/general.md#all>`__\n   -  `Any <https://github.com/Xython/Linq.py/blob/master/docs/general.md#any>`__\n\n-  List\n\n   -  `Extended <https://github.com/Xython/Linq.py/blob/master/docs/list.md#extended>`__\n   -  `Extend <https://github.com/Xython/Linq.py/blob/master/docs/list.md#extend>`__\n   -  `Sort <https://github.com/Xython/Linq.py/blob/master/docs/list.md#sort>`__\n   -  `Reversed <https://github.com/Xython/Linq.py/blob/master/docs/list.md#reversed>`__\n   -  `Reverse <https://github.com/Xython/Linq.py/blob/master/docs/list.md#reverse>`__\n\n-  Set\n\n   -  `Intersects <https://github.com/Xython/Linq.py/blob/master/docs/set.md#intersects>`__\n   -  `Union <https://github.com/Xython/Linq.py/blob/master/docs/set.md#union>`__\n\nHow to Contribute\n-----------------\n\n-  Design the `standard\n   library <https://github.com/Xython/Linq.py/tree/master/linq/standard>`__\n   for `Linq.py <https://github.com/Xython/Linq.py>`__.\n\n-  Write documents for the standard library and tutorials about how to\n   use `Linq.py <https://github.com/Xython/Linq.py>`__.\n\n-  Join `LinqPy Room <https://gitter.im/LinqPy/Lobby>`__ to discuss\n   about any aspects of `Linq.py <https://github.com/Xython/Linq.py>`__.\n\nFeel free to pull requests here.\n\n.. |Build Status| image:: https://travis-ci.org/Xython/Linq.py.svg?branch=master\n   :target: https://travis-ci.org/Xython/Linq.py\n.. |License| image:: https://img.shields.io/badge/license-MIT-yellow.svg\n   :target: https://github.com/Xython/Linq.py/blob/master/LICENSE\n.. |codecov| image:: https://codecov.io/gh/Xython/Linq.py/branch/master/graph/badge.svg\n   :target: https://codecov.io/gh/Xython/Linq.py\n.. |Coverage Status| image:: https://coveralls.io/repos/github/Xython/Linq.py/badge.svg?branch=master\n   :target: https://coveralls.io/github/Xython/Linq.py?branch=master\n.. |PyPI version| image:: https://img.shields.io/pypi/v/Linq.svg\n   :target: https://pypi.python.org/pypi/Linq\n",
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