Changelog

Significant changes in major and minor releases of this library:

Version 4.1 (January 2022)

Packaged using flit. Wheels now exist, and setuptools is no longer required.
This package now has a typical package structure, instead of being a single module. The code is in ordered_set/__init__.py instead of ordered_set.py.
There is an ordered_set/py.typed so that type checkers know about the types.
Use the type aliases SetLike[T] and OrderedSetInitializer[T] to simplify some types.
Updated the way overloaded type signatures are written to what MyPy currently expects.
Minimum Python version is 3.7.

Version 4.0 (January 2020)

Added type signatures inline to the code, instead of using type stubs.
Dropped Python 2 support. The minimum supported Python version is 3.5.

Version 3.1 (November 2018)

__getitem__ accepts NumPy arrays of indices, and returns a list of elements with those indices.
Updated in-place operations that took O(N^2) time, such as .difference_update(), to take O(N) time.
Clarified whether various methods mutate or copy the OrderedSet.
Added OrderedSet.get_loc and OrderedSet.get_indexer as aliases for OrderedSet.index, for interoperability with pandas.Index.
Added type stubs in a .pyi file.

Version 3.0 (June 2018)

Implemented the abstract base classes collections.MutableSet and collections.Sequence.
Changed the behavior of some methods to follow the MutableSet API.
Indexing an OrderedSet with [:] returns a copy, not the same object.

Version 2.0 (December 2015)

Tuples are allowable values in the set, and are not treated as "fancy indexing".
Added update and pop methods.

Version 1.4 (September 2015)

Added discard and clear methods.

Version 1.3 (April 2015)

Added support for pickling.

Version 1.2 (May 2014)

First Python 3 support.

Version 1.1 (August 2013)

Added tests.
Removed a broken implementation of discard.

Version 1.0 (August 2012)

First release.