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    "info": {
        "author": "Gr\u00e9gory Salvan",
        "author_email": "apieum@gmail.com",
        "bugtrack_url": null,
        "classifiers": [
            "Development Status :: 4 - Beta",
            "Environment :: Other Environment",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)",
            "Operating System :: OS Independent",
            "Programming Language :: Python",
            "Programming Language :: Python :: 3",
            "Topic :: Software Development :: Libraries :: Python Modules"
        ],
        "description": "********\nDucktype\n********\n\n.. image:: https://pypip.in/v/ducktype/badge.png\n        :target: https://pypi.python.org/pypi/ducktype\n\n\nProvides *isducktype*, a simple function to check ducktype.\n\n\nRoutine* 'A' is ducktype of 'B' when:\n  - 'A' number of arguments is compatible with 'B' (names not checked)\n  - OR A or B have varargs (*args) or keywords (**kwargs)\n\nArguments comparison between A and B is made within:\n  - the number of required arguments to call A is between minimum and maximum number of B arguments\n  - OR the number maximum of arguments to call A is between minimum and maximum number of B arguments\n\nrequired arguments means all arguments without defaults\n\nObject/Class 'A' is ducktype of 'B' when:\n  - it has at least same public members names (public if they don't start by '_')\n  - AND its methods are ducktypes of corresponding B methods.\n\nIf B has a method __ducktypecheck__, *isducktype* returns B.__ducktypecheck__(A)\n\n\nLike *isinstance* or *issubclass*, *isducktype* second argument can be either an objet or a tuple of objects.\n\n\nRoutine* in the sense: a user defined or builtins, function, method, or lambda.\n\n---------------------------------------------------------------------\n\n**Table of Contents**\n\n\n.. contents::\n    :local:\n    :depth: 1\n    :backlinks: none\n\n\n=============\nInstallation\n=============\n\nInstall it from pypi::\n\n  pip install ducktype\n\nor from sources::\n\n  git clone git@github.com:apieum/ducktype.git\n  cd ducktype\n  python setup.py install\n\n=====\nUsage\n=====\n\n--------------------------------\nExample 1 - comparing functions:\n--------------------------------\n\n\n.. code-block:: python\n\n  from ducktype import isducktype\n\n  func_a = lambda a1, a2, a3=None: None\n  func_b = lambda *b1: None\n  func_c = lambda **c2: None\n  func_d = lambda d1, d2: None\n  func_e = lambda e1: None\n  func_f = lambda f1, f2, f3, f4: None\n\n  assert isducktype(func_b, func_a)\n  assert isducktype(func_c, func_a)\n  assert isducktype(func_d, func_a)\n  assert isducktype(func_a, func_e) is False\n  assert isducktype(func_e, func_a) is False\n  assert isducktype(func_f, func_a) is False\n\n  # with a tuple (== Or)\n  assert isducktype(func_e, (func_a, func_b))\n  assert isducktype(func_e, (func_a, func_d)) is False\n\n--------------------------------\nExample 2 - comparing objects:\n--------------------------------\n\n\n.. code-block:: python\n\n\n  from ducktype import isducktype\n\n  class A(object):\n    _protected = 'hidden'\n    __private  = 'hidden'\n    attr1 = None\n\n    def method1(self, arg, kwargs=True):\n      return kwargs\n\n    def method2(self, arg):\n      return arg\n\n  class B(object):\n    attr1 = None\n\n    def method1(self, **kwargs):\n      return kwargs\n\n    def method2(self, arg1, arg2=None):\n      return None\n\n  class C(object):\n    attr1 = False\n\n    def method1(self, arg, kwarg):\n      return arg\n\n  class D(object):\n    attr1 = False\n    method1 = None\n    method2 = None\n\n  class E(object):\n    def method1(self, **kwargs):\n      return kwargs\n\n    def method2(self, arg1, arg2=None):\n      return None\n\n  # it doesn't care if it's an instance or a class\n  assert isducktype(A, B)\n  assert isducktype(A(), B)\n  assert isducktype(A, B())\n  assert isducktype(A(), B())\n\n  # You can call each A method as if it was C\n  assert isducktype(A, C)\n  # Reverse is not True\n  assert isducktype(C, A) is False\n\n  # Whereas D as same members as A, two are not functions\n  assert isducktype(A, D) is False\n  assert isducktype(D, A) is False\n\n  # E need attribute \"attr1\" to ducktype A\n  assert isducktype(A, E)\n  assert isducktype(E, A) is False\n\n--------------------------------\nExample 3 - overriding default:\n--------------------------------\n\n\n.. code-block:: python\n\n\n  from ducktype import isducktype\n\n  class A(object):\n    attr1 = None\n\n  class B(object):\n    attr1 = None\n    attr2 = None\n\n  class C(B):\n    @classmethod\n    def __ducktypecheck__(cls, maybe_duck):\n      return hasattr(maybe_duck, 'attr1')\n\n  class D(B):\n    def __ducktypecheck__(self, maybe_duck):\n      return hasattr(maybe_duck, 'attr1')\n\n  # A must not ducktype B\n  assert isducktype(A, B) is False\n\n  # Returns A.__ducktypecheck__(C)\n  assert isducktype(A, C)\n  assert isducktype(A, D) is False\n  assert isducktype(A, D())\n\n\n===========\nDevelopment\n===========\n\nAny feedback or help is welcome.\nYou can contact me by mail: apieum [at] gmail [dot] com\n\n\nLaunch test::\n\n  git clone git@github.com:apieum/ducktype.git\n  cd ducktype\n  nosetests --with-spec --spec-color ./\n\n\n\n\n.. image:: https://secure.travis-ci.org/apieum/ducktype.png?branch=master\n   :target: https://travis-ci.org/apieum/ducktype",
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