How Python 3.9 fixed decorators and improved dictionaries: 
This is the tenth in a series of articles about features that first appeared in a version of Python 3.x. Some of these versions have been out for a while. Python 3.9 was first released in 2020 with cool new features that are still underused. Here are three of them.
Adding dictionaries
Say you have a dictionary with “defaults,” and you want to update it with parameters. Before Python 3.9, the best option was to copy the defaults dictionary and then use the .update() method.
read more: Opensource.com Moshe Zadka
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