=========== Ordered Set

.. image:: https://badge.fury.io/py/orderedset.png :target: http://badge.fury.io/py/orderedset

.. image:: https://travis-ci.org/simonpercivall/orderedset.png?branch=master :target: https://travis-ci.org/simonpercivall/orderedset

.. image:: https://pypip.in/d/orderedset/badge.png :target: https://crate.io/packages/orderedset?version=latest

An Ordered Set implementation in Cython. Based on Raymond Hettinger's OrderedSet recipe_.

Example:

.. code-block:: python

>>> from orderedset import OrderedSet
>>> oset = OrderedSet([1, 2, 3])
>>> oset
OrderedSet([1, 2, 3])
>>> oset | [5, 4, 3, 2, 1]
OrderedSet([1, 2, 3, 5, 4])

• Free software: BSD license
• Documentation: http://orderedset.rtfd.org.

Features

• Works like a regular set, but remembers insertion order;
• Is approximately 5 times faster than the pure Python implementation overall (and 5 times slower than set);
• Compatible with Python 2.7 through 3.8;
• Supports the full set interface;
• Supports some list methods, like index and __getitem__.
• Supports set methods against iterables.

.. _Raymond Hettinger's OrderedSet recipe: http://code.activestate.com/recipes/576694/