# Python dictionaries are insertion-ordered from 3.7+

They are insertion-ordered in CPython implementation of Python 3.6 as an implementation detail. [Guido announced on the mailing list](https://mail.python.org/pipermail/python-dev/2017-December/151283.html) that it is officially part of the language spec in Python 3.7. From [the docs](https://docs.python.org/3.7/library/stdtypes.html#mapping-types-dict):

> Changed in version 3.7: Dictionary order is guaranteed to be insertion order. This behavior was implementation detail of CPython from 3.6.

`list(d)` on a dictionary returns a list of all the keys used in the dictionary, in insertion order. 

Sets are still unordered.