The example we see here ... It’s also possible to create or modify dictionaries programmatically, as you’ll see later on. Any mutable Python object doesn’t have a consistent hash value ...

Python’s implementation of object orientation does have a few quirks. For example, if you create a class variable, it can be read from a subclass without specifying scope like you’d expect.

Right from the start, the book explains how classes are used to model real-world objects, with both “toy” examples ... t usually make it into a book like this one, but Python Crash Course ...