=========
multidict

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Multidict is dict-like collection of key-value pairs where key
might occur 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 them to change
their own content.

Case insensitive (CIMultiDict and
CIMultiDictProxy) 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 C Extensions for speed.

License

Apache 2

Library Installation

.. code-block:: bash

$ pip install multidict

The library is Python 3 only!

PyPI contains binary wheels for Linux, Windows and MacOS. If you want to install
multidict on another operating system (or Alpine Linux inside a Docker) the
tarball will be used to compile the library from source. It requires a C compiler and
Python headers to be installed.

To skip the compilation, please use the MULTIDICT_NO_EXTENSIONS environment variable,
e.g.:

.. code-block:: bash

$ MULTIDICT_NO_EXTENSIONS=1 pip install multidict

Please note, the pure Python (uncompiled) version is about 20-50 times slower depending on
the usage scenario!!!

For extension development, set the MULTIDICT_DEBUG_BUILD environment variable to compile
the extensions in debug mode:

.. code-block:: console

$ MULTIDICT_DEBUG_BUILD=1 pip install multidict