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.
Import and create ordered set.
>>> from oset import oset >>> os = oset()
Raymond Hettinger, 19 Mar 2009
Raymond Hettinger, (All kudos to him :)
Carlos Martin <email@example.com>
under the Python Software Foundation License. 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.
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