Metadata-Version: 2.0
Name: metaset
Version: 1.0.2
Summary: A container for dicts of sets - alternative to dictset
Home-page: https://github.com/Polyconseil/metaset
Author: Polyconseil dev team
Author-email: autolib-dev@polyconseil.fr
License: BSD
Download-URL: http://pypi.python.org/pypi/metaset/
Keywords: metaset,dictset,set,container
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: Natural Language :: English
Classifier: Programming Language :: Python
Classifier: License :: OSI Approved :: BSD License
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.5

metaset
=======

This package provides a collection that is basically a "dict of sets", named MetaSet.

.. image:: https://travis-ci.org/Polyconseil/metaset.svg?branch=master
    :alt: Build status

.. image:: https://img.shields.io/pypi/pyversions/metaset.svg
    :alt: Supported Python versions

.. image:: https://img.shields.io/pypi/wheel/metaset.svg
    :alt: Wheel status

.. image:: https://img.shields.io/pypi/l/metaset.svg
    :alt: License

Links
-----

- Package on `PyPI`_: http://pypi.python.org/pypi/metaset/
- Source on `GitHub <http://github.com/>`_: http://github.com/Polyconseil/metaset/
- Build on `Travis CI <http://travis-ci.org/>`_: http://travis-ci.org/lionel-panhaleux/metaset/

Quickstart
----------

Install the package from PyPI_, using pip:

.. _PyPI: http://pypi.python.org/pypi/metaset/

.. code-block: sh

    pip install metaset


Or from GitHub:

.. code-block: sh

    $ git clone git://github.com/lionel-panhaleux/metaset.git

Import it in your code:

.. code-block: python

    from metaset import MetaSet

Usage is quite straight forward,
basic set operations are supported via the binary operators `+` `-` `|` `^`.

.. code-block: python

    >>> MetaSet(a={1, 2}, b={3}) | MetaSet(b={4}, c={5})
    {'a': {1, 2}, 'b': {3, 4}, 'c': {5}}

Detailed considerations
-----------------------

They are two ways to consider the "dict of sets" notion,
differing on how you handle the empty values for keys.

The easiest idea is to consider that a key with no content is non-existent.
This is how the dictset_ package is implemented.

In this alternative implementation,
we chose to keep the empty keys as meaningful elements,
allowing for smart unions and intersections.

.. code-block: python

    >>> MetaSet(a={1}) | Metaset(a={2}, b=set())
    {'a': {1, 2}, 'b': set()}

    >>> MetaSet(a={1}) & Metaset(a={2}, b={3})
    {'a': set()}

So, beware of how empty-keys are handled,
and consider using dictset_ if it is a better match for your use case.
The behavior for subtraction and symmetric difference,
although sound on a mathematical point of view, may not be what you want.

.. code-block: python

    >>> MetaSet(a={1}) - MetaSet(a={1})
    {'a': set()}

    >>> MetaSet(a={1}) ^ MetaSet(a={1})
    {'a': set()}

.. _dictset: https://code.google.com/archive/p/dictset/


