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        "author": "Amir Rachum",
        "author_email": "amir@rachum.com",
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        "classifiers": [
            "Environment :: Console",
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            "License :: OSI Approved :: MIT License",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 2"
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        "description": "A backport of the `yield from` semantic from Python 3.x to Python 2.7\r\n\r\nIf you want to nest generators in Python 3.x, you can use the ``yield from``\r\nkeywords. This allows you to automatically iterate over sub-generators and\r\ntransparently pass exceptions and return values from the top level caller\r\nto the lowest generator.\r\n\r\n```.py\r\ndef subgen():\r\n    yield 2\r\n    yield 3\r\n\r\ndef gen():\r\n    yield 1\r\n    yield from subgen()  # Python 3.x only\r\n    yield 4\r\n\r\ndef main():\r\n    for i in gen():\r\n        print i,\r\n\r\n>>> main()\r\n... 1 2 3 4\r\n```\r\n\r\nThis functionality is not available in Python 2.x, and we emulate it using the\r\n`yieldfrom` decorator and the helper `From` class:\r\n\r\n```.py\r\nfrom yieldfrom import yieldfrom, From\r\ndef subgen():\r\n    yield 2\r\n    yield 3\r\n\r\n@yieldfrom\r\ndef gen():\r\n    yield 1\r\n    yield From(subgen())\r\n    yield 4\r\n\r\ndef main():\r\n    for i in gen():\r\n        print i,\r\n\r\n>>> main()\r\n... 1 2 3 4\r\n```\r\n\r\nAdvanced usage allows returning a value from the subgenerator using \r\n`StopIteration`. Using `Return` does this conveniently:\r\n\r\n```.py\r\nfrom yieldfrom import yieldfrom, From, Return\r\n\r\ndef subgen():\r\n    yield 2\r\n    yield 3\r\n    Return(100)  # Raises `StopIteration(100)`\r\n\r\n@yieldfrom\r\ndef gen():\r\n    yield 1\r\n    ret = (yield From(subgen()))\r\n    yield 4\r\n    yield ret\r\n\r\ndef main():\r\n    for i in gen():\r\n        print i,\r\n\r\n>>> main()\r\n... 1 2 3 4 100\r\n```\r\n\r\nSubgenerators can be nested on multiple levels, each one requiring additional\r\ndecoration by `yieldfrom`:\r\n\r\n```.py\r\ndef subsubgen():\r\n    yield 2\r\n\r\n@yieldfrom\r\ndef subgen():\r\n    yield From(subsubgen())\r\n    yield 3\r\n\r\n@yieldfrom\r\ndef gen():\r\n    yield 1\r\n    yield From(subgen())\r\n    yield 4\r\n\r\ndef main():\r\n    for i in gen():\r\n        print i,\r\n\r\n>>> main()\r\n... 1 2 3 4\r\n```\r\n\r\nExceptions thrown into the top-level generator can be handled in relevant\r\nsubgenerators:\r\n\r\n```.py\r\ndef subsubgen():\r\n    try:\r\n        yield 2\r\n    except ValueError:\r\n        yield 200\r\n\r\n@yieldfrom\r\ndef subgen():\r\n    yield From(subsubgen())\r\n    yield 3\r\n\r\n@yieldfrom\r\ndef gen():\r\n    yield 1\r\n    yield From(subgen())\r\n    yield 4\r\n\r\ndef main():\r\n    try:\r\n        g = gen()\r\n        while True:\r\n            i = g.next()\r\n            if i == 2:\r\n                i = g.throw(ValueError())\r\n        print i,\r\n    except StopIteration:\r\n        pass\r\n\r\n>>> main()\r\n... 1 200 3 4\r\n```\r\n\r\nNote that if you use `yield From()` on a simple iterable (`list`, \r\n`tuple`, etc) then the individual members of the iterator will be yielded on\r\neach iteration (perhaps in that case you need the usual `yield`).\r\n\r\n```.py\r\n@yieldfrom\r\ndef gen():\r\n    yield From([1, 2, 3])\r\n    yield [1, 2, 3]\r\n\r\ndef main():\r\n    for i in gen():\r\n        print i\r\n\r\n>>> main()\r\n... 1\r\n... 2\r\n... 3\r\n... [1, 2, 3]\r\n```\r\n\r\nPassing non-iterable objects to `From` will result in an empty\r\ngenerator that does nothing.\r\n\r\n```.py\r\n@yieldfrom\r\ndef gen():\r\n    yield From(None)\r\n    yield 1\r\n\r\ndef main():\r\n    for i in gen():\r\n        print i\r\n\r\n>>> main()\r\n... 1\r\n```\r\n\r\nThis module is an adaptation of the following Python recipe:\r\nhttp://code.activestate.com/recipes/576727  \r\nModifications include bug fixes in exception handling, naming, documentation,\r\nhandling of empty generators, etc.\r\n\r\n\r\n",
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