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        "author": "Chris Targett",
        "author_email": "chris@xlevus.net",
        "bugtrack_url": null,
        "classifiers": [
            "Development Status :: 4 - Beta",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: MIT License",
            "Programming Language :: Python :: 3.5",
            "Programming Language :: Python :: 3.6"
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        "description": "Python-Diana\n=================================\n\n.. image:: https://img.shields.io/pypi/v/diana.svg?style=for-the-badge\n   :target: https://pypi.python.org/pypi/diana/\n\n.. image:: https://img.shields.io/pypi/pyversions/diana.svg?style=for-the-badge\n   :target: https://pypi.python.org/pypi/diana/\n\n.. image:: https://img.shields.io/travis/xlevus/python-diana.svg?style=for-the-badge\n   :target: https://travis-ci.org/xlevus/python-diana\n\n\nA simple async-friendly dependency injection framework for Python 3.\n\nSupports:\n - Async methods\n - Parametrized dependencies\n - Type annotations\n\n\nSimple Example\n^^^^^^^^^^^^^^\n\n.. code-block:: python\n\n   import diana\n\n   class MyThing(object):\n       def __init__(self, prefix):\n           self.prefix = prefix\n\n       def get(self, suffix):\n           return self.prefix + suffix\n\n   class MyModule(diana.Module):\n       @diana.provider\n       def provide_thing(self) -> MyThing:\n           return MyThing(\"a_prefix_\")\n\n\n   @diana.injector\n   def requires_a_thing(*, thing: MyThing):\n       return thing.get('suffix')\n\n   diana.injector.load_module(MyModule())\n\n   requires_a_thing()  # returns \"a_prefix_suffix\"\n\n\nParametrized Dependencies\n^^^^^^^^^^^^^^^^^^^^^^^^^\n\n.. code-block:: python\n\n   import diana\n   import typing\n\n   Snake = typing.NewType('Snake', str)\n\n   class SnakeModule(diana.Module):\n       @diana.provider\n       def provide_snake(self, length: int) -> Snake:\n           return Snake('-' + ('=' * length) + e)\n\n\n   @diana.injector(a_snake=Snake)\n   @diana.injector.param('a_snake', length=5)\n   def snake_printer(a_snake):\n       print(a_snake, \"Hissss\")\n\n   diana.injector.load_module(SnakeModule())\n\n   snake_printer() # Prints: -=====e Hissss\n\n\nModules\n^^^^^^^\n\nModules provide dependencies.\n\n.. note:: The same dependency can be provided by both an async and sync providers\n   as shown in the `AType` providers below.\n\n.. code-block:: python\n\n   class MyModule(diana.Module):\n       def load(self, injector):\n           # Called when the module is loaded against `injector`.\n           pass\n\n       def unload(self, injector):\n           # Called when the module is unloaded against `injector`.\n           pass\n\n       @diana.provider\n       def provide_atype(self) -> AType:\n           return AType()\n\n       @diana.provider\n       async def provide_atype_async(self) -> AType:\n           await async_stuff()\n           return AType()\n\n       @diana.provides(BType)\n       def provide_btype(self):\n           return BType()\n\n\n   @MyModule.provider\n   def provide_ctype(module) -> CType:\n       return CType()\n\n\n   @MyModule.provides(DType)\n   def provide_dtype(module):\n       return DType()\n\n\nInjection Styles\n^^^^^^^^^^^^^^^^\n\nThere are three formats for injecting dependencies into functions\n\n * Type Annotation w/ inspect\n * Explicit\n * Parametrized\n\nThe following examples are all equivalent.\n\n.. code-block:: python\n\n   # Type Annotation w/ Inspect\n   @diana.injector\n   def func_a(*, a: AType, b: BType):\n       pass\n\n   # Explicit\n   @diana.injector.inject(a=AType, b=BType)\n   def func_a(*, a, b):\n       pass\n\n   # Parametrized.\n   # Note, if the second argument to param() is omitted, the type must be\n   # hinted by one of the previous methods.\n   @diana.injector.param('a', AType, a_param=...)\n   @diana.injector.param('b', BType, b_param=...)\n   def func_a(*, a, b):\n       pass\n\nIn all cases, injected arguments must be keyword-only.\n\nAlternatively, a dependency can be manually provided, bypassing any injection.\n\n.. code-block:: python\n\n   func_a(a=AType(), b=BType())\n\n\nMissing Features\n^^^^^^^^^^^^^^^^\n\nCompared to other dependency injection frameworks, a few features are missing.\n\n * Scope management - Currently there is no provision for scope to be managed by\n   diana and remains the Module/provider's responsibility.\n * Constructor/Instance Injecting - it is not possible to have Diana set attributes\n   on instances by decorating the class definition.\n * Thread safety - There have been no attempts to make Diana thread safe. In theory,\n   if modules are only loaded once (presumably at runtime), thread safety can be managed\n   by the Modules/providers.\n\n\n",
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