An OrderedDict is a dictionary subclass that remembers the order that keys were first inserted. ... A regular dict doesn't track the insertion order, and iterating it gives the values in an arbitrary order. By contrast, the order the items are inserted is remembered by OrderedDict.

What is an ordered dict in Python?

Python's OrderedDict is a dict subclass that preserves the order in which key-value pairs, commonly known as items, are inserted into the dictionary. When you iterate over an OrderedDict object, items are traversed in the original order. If you update the value of an existing key, then the order remains unchanged.

Is Python dict key ordered?

As of Python 3.6, for the CPython implementation of Python, dictionaries maintain insertion order by default. This is considered an implementation detail though; you should still use collections. OrderedDict if you want insertion ordering that's guaranteed across other implementations of Python.