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Multidict is dict-like collection of key-value pairs where key might occur more than once in the container.
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.
Apache 2
.. 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!!!
See RTD page <http://multidict.aio-libs.org/en/latest/changes>
_.
FAQs
multidict implementation
We found that multidict demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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