The historical background for those interested… The ordered dict for Python was originally an implementation detail, part of a more compact dict representation

The historical background for those interested… The ordered dict for Python was originally an implementation detail, part of a more compact dict representation that was first proposed for Python in 2012 [1], implemented for PyPy in 2015 [2], and merged into CPython 3.6 in 2016 [3] [4]. [1]: https://mail.python.org/pipermail/python-dev/2012-December/123028.html https://mail.python.org/pipermail/python-dev/2012-December/1... [2]: https://morepypy.blogspot.com/2015/01/faster-more-memory-efficient-and-more.html https://morepypy.blogspot.com/2015/01/faster-more-memory-eff... [3]: https://mail.python.org/pipermail/python-dev/2016-September/146327.html https://mail.python.org/pipermail/python-dev/2016-September/... [4]: https://news.ycombinator.com/item?id=12460936 https://news.ycombinator.com/item?id=12460936 The decision to add it officially to the language spec wasn’t made until Python 3.7 in 2017. [5] [5]: https://mail.python.org/pipermail/python-dev/2017-December/151283.html https://mail.python.org/pipermail/python-dev/2017-December/1... "Guido says ‘Make it so.’"