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        "author": "Adrian Room",
        "author_email": "ingolemo@gmail.com",
        "bugtrack_url": null,
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            "Development Status :: 3 - Alpha",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
            "Natural Language :: English",
            "Programming Language :: Python :: 2",
            "Programming Language :: Python :: 2.7",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.4",
            "Programming Language :: Python :: 3.5",
            "Programming Language :: Python :: 3.6",
            "Programming Language :: Python :: Implementation :: CPython",
            "Programming Language :: Python :: Implementation :: PyPy",
            "Topic :: Software Development :: Libraries"
        ],
        "description": "\nLenses\n======\n\n.. image:: https://travis-ci.org/ingolemo/python-lenses.svg\n    :target: https://travis-ci.org/ingolemo/python-lenses\n\n.. image:: https://codecov.io/gh/ingolemo/python-lenses/branch/master/graph/badge.svg\n    :target: https://codecov.io/gh/ingolemo/python-lenses\n\nLenses is a python library that helps you to manipulate large\ndata-structures without mutating them. It is inspired by the lenses in\nHaskell, although it's much less principled and the api is more suitable\nfor python.\n\n\nInstallation\n------------\n\nYou can install the latest version from pypi using pip like so::\n\n    pip install lenses\n\nYou can uninstall similarly::\n\n    pip uninstall lenses\n\n\nDocumentation\n-------------\n\nThe lenses library makes liberal use of docstrings, which you can access\nas normal with the ``pydoc`` shell command, the ``help`` function in\nthe repl, or by reading the source yourself.\n\nMost users will only need the docs from ``lenses.UnboundLens``. If you\nwant to add hooks to allow parts of the library to work with custom\nobjects then you should check out the ``lenses.hooks`` module. Most of\nthe fancy lens code is in the ``lenses.optics`` module for those who\nare curious how everything works.\n\nSome examples are given in the `examples`_ folder and the `documentation`_\nis available on ReadTheDocs.\n\n.. _examples: examples\n.. _documentation: https://python-lenses.readthedocs.io/en/latest/\n\n\nExample\n-------\n\n>>> from pprint import pprint\n>>> from lenses import lens\n>>>\n>>> data = [{'name': 'Jane', 'scores': ['a', 'a', 'b', 'a']},\n...         {'name': 'Richard', 'scores': ['c', None, 'd', 'c']},\n...         {'name': 'Zoe', 'scores': ['f', 'f', None, 'f']}]\n... \n>>> format_scores = lens.Each()['scores'].Each().Instance(str).call_upper()\n>>> cheat = lens[2]['scores'].Each().set('a')\n>>>\n>>> corrected = format_scores(data)\n>>> pprint(corrected)\n[{'name': 'Jane', 'scores': ['A', 'A', 'B', 'A']},\n {'name': 'Richard', 'scores': ['C', None, 'D', 'C']},\n {'name': 'Zoe', 'scores': ['F', 'F', None, 'F']}]\n>>>\n>>> cheated = format_scores(cheat(data))\n>>> pprint(cheated)\n[{'name': 'Jane', 'scores': ['A', 'A', 'B', 'A']},\n {'name': 'Richard', 'scores': ['C', None, 'D', 'C']},\n {'name': 'Zoe', 'scores': ['A', 'A', 'A', 'A']}]\n\n\nThe definition of ``format_scores`` means \"for each item in the data take\nthe value with the key of ``'scores'`` and then for each item in that list\nthat is an instance of ``str``, call its ``upper`` method on it\". That one\nline is the equivalent of this code:\n\n::\n\n    def format_scores(data):\n        results = []\n        for entry in data:\n            result = {}\n            for key, value in entry.items():\n                if key == 'scores':\n                    new_value = []\n                    for letter in value:\n                        if isinstance(letter, str):\n                            new_value.append(letter.upper())\n                        else:\n                            new_value.append(letter)\n                    result[key] = new_value\n                else:\n                    result[key] = value\n            results.append(result)\n        return results\n\n\nLicense\n-------\n\npython-lenses is free software: you can redistribute it and/or modify it\nunder the terms of the GNU General Public License as published by the\nFree Software Foundation, either version 3 of the License, or (at your\noption) any later version.\n\nThis program is distributed in the hope that it will be useful, but\nWITHOUT ANY WARRANTY; without even the implied warranty of\nMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General\nPublic License for more details.\n\nYou should have received a copy of the GNU General Public License along\nwith this program. If not, see http://www.gnu.org/licenses/.\n\n\n",
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        "name": "lenses",
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