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        "author": "Eric V. Smith",
        "author_email": "eric@trueblade.com",
        "bugtrack_url": null,
        "classifiers": [
            "Development Status :: 5 - Production/Stable",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: Apache Software License",
            "Programming Language :: Python :: 2.7",
            "Programming Language :: Python :: 3.3",
            "Programming Language :: Python :: 3.4",
            "Programming Language :: Python :: 3.5",
            "Topic :: Software Development :: Libraries :: Python Modules"
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        "description": "=======\ncalllib\n=======\n\nOverview\n========\n\n``calllib`` provides 3 functions, ``apply``, ``getargs``, and\n``inspect_params``. These functions are used to inspect and call\nPython functions whose parameters are not known in advance, but are\ndetermined at runtime from a mapping of available objects.\n\nThis is particularly useful in plug-in frameworks, where you don't\nwant every callback function to be required to have identical\nsignatures. Instead, each function can take a subset of available\nparameters.\n\nFor example::\n\n    >>> from __future__ import print_function\n    >>> import calllib\n\n    >>> def callback1(time):\n    ...    print('callback1 called at:', time)\n\n    >>> def callback2(time, reason):\n    ...    print('callback2 called at:', time, 'reason:', reason)\n\n    # register the callbacks\n    >>> callbacks = [callback1, callback2]\n\n    # elsewhere: compute the total universe of possible\n    #  callback arguments\n    >>> args = {'time': 'noon', 'reason': 'abort'}\n    >>> for callback in callbacks:\n    ...    calllib.apply(callback, args)  # execute each callback\n    callback1 called at: noon\n    callback2 called at: noon reason: abort\n\nThe last line shows that you can call any callback routine without\nknowing its exact arguments, as long as its arguments are a subset of\nthe available arguments.\n\napply()\n-------\n\n``apply(callable, args)``\n\n  * `callable` - Any callable object that can be inspected with the\n    `inspect` module.\n\n  * `args` - A mapping object, typically a `dict`, that contains the\n    available arguments that will be passed to `callable`.\n\n  `callable` is inpsected with ``getargs`` and the its parameters are\n  extracted by name. For each parameter the corresponding value is\n  retrieved from `args` by name and passed to the callable.\n\n  ``apply`` returns the result of executing `callable` with the\n  computed arguments.\n\n\ngetargs()\n---------\n\n``getargs(callable, args)``\n\n  * `callable` - Any callable object that can be inspected with the\n    `inspect` module.\n\n  * `args` - A mapping object, typically a `dict`, that contains the\n    available arguments that could be passed to `callable`.\n\n  `callable` is inspected to determine its parameters. For each\n  parameter the corresponding value is retrieved from `args`. If a\n  parameter is not found in args `callable` has a default value for\n  that parameter, the default value is retrieved.\n\n  ``getargs`` returns a list of actual argument values that would be\n  passed to `callable`.\n\n\ninspect_params()\n----------------\n\n``inspect_params(callable)``\n\n  * `callable` - Any callable object that can be inspected with the\n    `inspect` module.\n\n  `callable` is inspected to deterine its parameters and default\n  values, if any. ``inspect_params`` returns a tuple containing a\n  list of parameter names and a dict with default values, if any.  For\n  example::\n\n    >>> def foo(x, y=0, z=6): pass\n    ...\n    >>> calllib.inspect_params(foo)\n    (['x', 'y', 'z'], {'y': 0, 'z': 6})\n\n    >>> class Baz(object):\n    ...     def __init__(self, x, y='hello'): pass\n    ...\n    >>> calllib.inspect_params(Baz)\n    (['x', 'y'], {'y': 'hello'})\n\n\nTypes of callables supported\n============================\n\n``calllib`` supports any callable written in Python. This includes\nfunctions, bound and unbound methods, classes, and object instances\nwith `__call__` members.\n\nBecause they are not introspectable by the inspect module, built in\nPython functions such as ``len`` cannot be used with ``apply``.\n\nDefault arguments\n=================\n\nFunctions with default arguments are fully supported by\n``calllib``. If an argument is not specified in the `args` parameter\nto ``apply`` and it has a default, the default value will be used.\n\nTesting\n=======\n\nTo test, run 'python setup.py test'. On python >= 3.0, this also runs the doctests.\n\nChange log\n==========\n\n1.8 2016-10-27 Eric V. Smith\n----------------------------\n\n* Remove hack for changing RPM name (issue #7).\n\n* Always require setuptools (issue #6).\n\n* No code changes.\n\n1.7 2015-05-16 Eric V. Smith\n----------------------------\n\n* Removed 'test' package, so it won't get installed by bdist_*. It's still\n  included in sdists.\n\n* No code changes.\n\n1.6 2015-05-15 Eric V. Smith\n----------------------------\n\n* Changed RPM name to python3-calllib if running with python 3.\n\n* No code changes.\n\n1.5 2014-12-07 Eric V. Smith\n----------------------------\n\n* Added inspect_params (issue #5).\n\n1.4 2014-07-24 Eric V. Smith\n----------------------------\n\n* Release version 1.4. No code changes.\n\n* Add a README.txt entry on running the test suite.\n\n* Fix missing test/__init__.py in the sdist.\n\n1.3 2014-03-14 Eric V. Smith\n----------------------------\n\n* Add MANIFEST.in to MANIFEST.in, so it will be included in sdists\n  (issue #4).\n\n1.2 2014-02-12 Eric V. Smith\n----------------------------\n\n* New release just to update development status classifier.\n\n1.1 2014-02-12 Eric V. Smith\n----------------------------\n\n* Produce an RPM named python-calllib (issue #3).\n\n* Support python3 (issue #2).\n\n* Moved tests to a separate module (issue #1).\n\n1.0 2011-11-10 Eric V. Smith\n----------------------------\n\n* Finalized API.\n\n* Added tests for derived classes.\n\n0.2 2011-11-10 Eric V. Smith\n----------------------------\n\n* Allow for classes with no __init__ method.\n\n* Normalize test names.\n\n0.1 2011-11-09 Eric V. Smith\n----------------------------\n\n* Initial release.\n\n\n",
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