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        "author": "G\u00fcnther Jena",
        "author_email": "guenther@jena.at",
        "bugtrack_url": null,
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            "Development Status :: 5 - Production/Stable",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: MIT License",
            "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",
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        "description": "===================\nPython RevisionDict\n===================\n\n.. image:: https://img.shields.io/pypi/v/revisiondict.svg\n        :target: https://pypi.python.org/pypi/revisiondict\n\n.. image:: https://img.shields.io/travis/semiversus/python-revisiondict.svg\n        :target: https://travis-ci.org/semiversus/python-revisiondict\n\n.. image:: https://codecov.io/gh/semiversus/python-revisiondict/branch/master/graph/badge.svg\n  :target: https://codecov.io/gh/semiversus/python-revisiondict\n\n.. image:: https://img.shields.io/github/license/semiversus/python-revisiondict.svg\n        :target: https://en.wikipedia.org/wiki/MIT_License\n\nRevisionDict works like an ordinary dictionary with additional revision keeping of changes. It remembers the order when\nkeys were *updated* (in contrast to the ``OrderedDict`` which is remembering the order when keys are *inserted*).\n\nIt is revision tracking the overall dictionary, but does not store each earlier value for each key in the dictionary.\nIt's basically answering the following questions:\n\n* What is the actual revision number?\n* What changed since revsion number *N*?\n* In which revision has value of key *K* changed the last time?\n\nUse `RevisionDict` to build caching systems, interface multiple clients to a common database,\npublish/subscribe systems,...\n\nAdditional functionality compared to ``dict()``:\n\n* ``.revision`` - returning the actual revision as integer (starting with 0)\n* ``.base_revision`` - revision before oldest item changed (or 0 on empty dict)\n* ``.key_to_revision(key)`` - return the revision when the given key was changed\n* ``.checkout(start=0)`` - return a dict with changes since ``start``\n\nInstall\n-------\n\n.. code-block:: bash\n\n    pip install revisiondict\n\nExample\n-------\n\n.. code::python\n\n>>> d=RevisionDict()\n>>> d.revision                    # get revision (is 0 at init)\n0\n>>> d.base_revision               # get revision before oldest change\n0\n\nAdding new items:\n\n.. code::python\n\n>>> d['a']=0; d['b']=1; d['c']=2  # make three updates\n>>> d.revision                    # showing 3 changes\n3\n>>> d.base_revision               # get revision before oldest change\n0\n\nInspecting content of RevisionDict:\n\n.. code::python\n\n>>> d.checkout()=={'a': 0, 'b': 1, 'c': 2} # get a dictionary with all changes\nTrue\n>>> d.checkout(2)                 # get all changes starting with rev. 2\n{'c': 2}\n>>> d.checkout(3)                 # all changes starting with actual revision\n{}\n>>> d.key_to_revision('b')        # revision where 'b' was changed last time\n2\n>>> d\nRevisionDict([_Item(key='a', value=0, revision=1), _Item(key='b', value=1, revision=2), _Item(key='c', value=2, revision=3)])\n\nUpdate items:\n\n.. code::python\n\n>>> d['a']=3                      # update value of 'a' (was 0 before)\n>>> d.revision\n4\n>>> d.base_revision\n1\n>>> d.key_to_revision('a')\n4\n>>> d.checkout(3)                 # get all changes starting with rev. 3\n{'a': 3}\n>>> tuple(d.keys())               # iterate over keys (ordered by time of update)\n('b', 'c', 'a')\n\n\n",
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