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    "info": {
        "author": "Martin Domke",
        "author_email": "mail@martindomke.net",
        "bugtrack_url": null,
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            "Environment :: Console",
            "Intended Audience :: Developers",
            "License :: Other/Proprietary License",
            "Operating System :: MacOS :: MacOS X",
            "Operating System :: POSIX :: Linux",
            "Programming Language :: Python",
            "Programming Language :: Python :: 2",
            "Programming Language :: Python :: 3",
            "Topic :: Software Development :: Libraries"
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        "description": ".. image:: https://img.shields.io/pypi/v/signaling.svg?style=flat-square\n    :target: https://pypi.python.org/pypi/signaling\n.. image:: https://img.shields.io/travis/mdomke/signaling/master.svg?style=flat-square\n    :target: https://travis-ci.org/mdomke/signaling\n.. image:: https://img.shields.io/pypi/l/signaling.svg?style=flat-square\n    :target: https://pypi.python.org/pypi/signaling\n.. image:: https://img.shields.io/coveralls/mdomke/signaling.svg?style=flat-square\n    :target: https://github.com/mdomke/signaling\n\nWhat is this?\n=============\n\n``signaling`` is a simple implementation of the `signal/slot pattern`_ as \nknown from the `Qt framework`_.\nIt has no external requirements and 100% test-coverage.\n\n\nInstallation\n============\n\nThe usual\n\n.. code-block:: bash\n\n  pip install signaling\n\n\nHow to use it?\n==============\n\nConsider that you have a function that should be called whenever a connected signal\nis emitted, as illustrated by the following code block:\n\n.. code-block:: python\n\n  def slot(arg):\n    print(\"Slot called with {}\".format(arg))\n\n  signal = Signal(args=['arg'])\n  signal.connect(slot)\n  signal.emit(arg=1)  # Slot called with 1\n\nIn fact you can connect multiple slots to the same signal, as long as they share the\nsame function signature.\n\nNotice that the ``signaling`` library performs some sanity checks when connecting\nslots and emitting signals.\n\n* All slots connected to a signal have to provide the same argument specifiction as\n  denoted by the ``args`` parameter of the ``Signal`` constructor.\n* An ``emit``-call has to be made with the exact same arguments as specified with the\n  ``Signal`` constructor.\n\nSo all of the below examples would raise an exception:\n\n.. code-block:: python\n\n  def slot_with_arg(arg):\n    pass\n\n  def slot_without_arg():\n    pass\n\n  # InvalidSlot: Slot 'slot_with_arg' has to callable without arguments\n  Signal().connect(slot_with_arg)  \n\n  # InvalidSlot: Slot 'slot_without_args' has to accept args ['arg'] or **kwargs.\n  Signal(args['arg']).connect(slot_without_arg)\n\n  s = Signal()\n  s.connect(slot_without_args)\n  # InvalidEmit: Emit has to be called without arguments.\n  s.emit(foo=1)\n\n\n.. _qt framework: http://www.qt.io/\n.. _signal/slot pattern: https://en.wikipedia.org/wiki/Signals_and_slots",
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