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        "author": "Byron Ruth",
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            "Framework :: Django",
            "Intended Audience :: Developers",
            "Intended Audience :: Information Technology",
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            "License :: OSI Approved :: BSD License",
            "Programming Language :: Python :: 2.6",
            "Programming Language :: Python :: 2.7"
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        "description": "# State Transition System (STS) for Django\n\n[State Transition Systems][1] have less constraints than Finite State\nAutomata, and can be utilized for various use cases.\n\nThe core components include:\n\n- State\n- Event\n- Transition\n- System\n\n**Events** cause a **transition** from some **state** to a new state within\na given **system**.\n\nThe API supports defining _immediate_ transitions and _long-running_\ntransitions. Now, for a riveting example..\n\n```python\nsystem = System(name='Example 1')\nsystem.save()\n\n# Immediate transition.. event => state\nsystem.transition('Door Opened', event='Open Door')\n\n# 'Long-running' transitions.. event happens\nsystem.start_transition('Close Door Slowly')\n\n# Time passes..\ntime.sleep(2)\n\n# The resulting state..\nsystem.end_transition('Door Closed')\n```\n\nTo remove the boilerplate from the above example, use the `transition`\ncontext manager instead:\n\n```python\nfrom sts.contextmanagers import transition\n\nwith transition('Example 1', 'Door Closed', event='Close Door Slowly'):\n    time.sleep(2)\n```\n\nA model object can be associated directly with a `System` using Django's\nContentTypes framework generic foreign keys.\n\n```python\ndoor = Door.objects.get(name='Door #1')\nsystem = System(content_object=door)\n# ...\n```\n\n`System` objects have a few extra conveniences:\n\n```python\n# number of transitions\nlen(system) == system.length\n\n# iteration starting with the first transition\nfor trans in system:\n    ...\n\n# indexing and slices\nsystem[:3]  # first 3 transitions\nsystem[-3:] # last 3 transitions\nsystem[:-3] # all except the last 3 transitions\nsystem[1:3] # arbitrary slice\nsystem[2]   # specific transition\n```\n\nThis enables bringing in django-sts to an existing model to begin tracking\nstates of objects.\n\nIt even comes with an abstract `STSModel` that augments a model with the above\nmethods for seamless integration (it does not add any model fields):\n\n```python\nclass Door(STSModel):\n    name = models.CharField(max_length=20)\n\ndoor = Door()\ndoor.save()\ndoor.transition('Door Closed', event='Close Door')\n```\n\nThe library leaves it up to the application to implement the constraints of a\nfinite state automata/machine.\n\n[1]: http://en.wikipedia.org/wiki/State_transition_system\n",
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