oset

oset

Set that remembers original insertion order.

Runs on Py2.5 or later (and runs on 3.0 or later without any modifications). For Python2.5, a local backport of ABC classes is also used.

Implementation based on a doubly linked link and an internal dictionary. This design gives OrderedSet the same big-Oh running times as regular sets including O(1) adds, removes, and lookups as well as O(n) iteration.

Usage

Import and create ordered set. ::

>>> from oset import oset
>>> os = oset()

Requires

• Python 2.5+

Changes

Version 0.1

• http://code.activestate.com/recipes/576694-orderedset/
• Raymond Hettinger, 19 Mar 2009

Contributors

• Raymond Hettinger, (All kudos to him :)

• Carlos Martin [e-mail]

under the Python Software Foundation License <http://www.opensource.org/licenses/PythonSoftFoundation.php>_. License

Copyright (c) 2009, Raymond Hettinger, and others All rights reserved.

Package structured based on the one developed to odict Copyright (c) 2010, BlueDynamics Alliance, Austria

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of the BlueDynamics Alliance nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

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