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========= multidict ========= .. image:: https://img.shields.io/pypi/v/multidict.svg :target: https://pypi.org/project/multidict .. image:: https://readthedocs.org/projects/multidict/badge/?version=latest :target: http://multidict.readthedocs.org/en/latest/?badge=latest .. image:: https://img.shields.io/travis/aio-libs/multidict/master.svg?label=Linux%20build%20%40%20Travis%20CI :align: right :target: http://travis-ci.org/aio-libs/multidict .. image:: https://img.shields.io/appveyor/ci/asvetlov/multidict/master.svg?label=Windows%20build%20%40%20Appveyor :align: right :target: https://ci.appveyor.com/project/asvetlov/multidict/branch/master .. image:: https://img.shields.io/pypi/pyversions/multidict.svg :target: https://pypi.org/project/multidict .. image:: https://codecov.io/gh/aio-libs/multidict/branch/master/graph/badge.svg :target: https://codecov.io/gh/aio-libs/multidict :alt: Coverage metrics .. image:: https://badges.gitter.im/Join%20Chat.svg :target: https://gitter.im/aio-libs/Lobby :alt: Chat on Gitter Multidict is dict-like collection of *key-value pairs* where key might be occurred more than once in the container. Introduction ------------ *HTTP Headers* and *URL query string* require specific data structure: *multidict*. It behaves mostly like a regular ``dict`` but it may have several *values* for the same *key* and *preserves insertion ordering*. The *key* is ``str`` (or ``istr`` for case-insensitive dictionaries). ``multidict`` has four multidict classes: ``MultiDict``, ``MultiDictProxy``, ``CIMultiDict`` and ``CIMultiDictProxy``. Immutable proxies (``MultiDictProxy`` and ``CIMultiDictProxy``) provide a dynamic view for the proxied multidict, the view reflects underlying collection changes. They implement the ``collections.abc.Mapping`` interface. Regular mutable (``MultiDict`` and ``CIMultiDict``) classes implement ``collections.abc.MutableMapping`` and allows to change their own content. *Case insensitive* (``CIMultiDict`` and ``CIMultiDictProxy``) ones assume the *keys* are case insensitive, e.g.:: >>> dct = CIMultiDict(key='val') >>> 'Key' in dct True >>> dct['Key'] 'val' *Keys* should be ``str`` or ``istr`` instances. The library has optional Cython_ optimization for sake of speed. License ------- Apache 2 .. _aiohttp: https://github.com/KeepSafe/aiohttp .. _Cython: http://cython.org/ Changelog --------- See `RTD page <http://multidict.readthedocs.org/en/latest/changes.html>`_.