Python's collections.abc | InvertibleDict

Learn your ABCs!
That's Abstract Base Classes, by the way. Python provides a standard set of interfaces for abstract collections that are widely used. They come in the collections.abc module and can be used for type hinting purposes, runtime interface checking, as well as being usable as base classes to define many interface functions based on just a few. For instance, if you define _getitem__, __iter_ and _len__, then Python can automatically define the rest of the Mapping interface functions __contains__, keys, items, values, get, __eq__, and __ne_ by using the ones you provided. We demonstrate abstract collections by implementing an invertible dictionary class that is a MutableMapping.
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CHAPTERS
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0:00 Intro
0:35 All the ABCs
2:28 Type hinting
4:03 Runtime Interface Checking
5:38 InvertibleDict
13:44 Outro