Web Reference: May 29, 2023 · Python Protocols and Abstract Base Classes (ABCs) share similarities in defining interfaces, but they also have distinct differences in syntax, usage, and intended purposes. To distinguish between protocol class variables and protocol instance variables, the special ClassVar annotation should be used. By default, protocol variables as defined above are considered readable and writable. To define a read-only protocol variable, one can use an (abstract) property. Here I will give a brief overview of ABCs, if you want a much more detailed explanation see this great video by one of the creators of ABCs. In general there are two use cases for ABCs, as a pure ABC that defines an "interface" and as a tool for code re-use via the Framework Design Pattern or through Mixins.
YouTube Excerpt: Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, I'm revisiting
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