“@classmethod” is a decorator for class methods from "summary" of Fluent Python by Luciano Ramalho
The `@classmethod` decorator is a built-in Python decorator that is used to define a method as a class method. When a method in a class is decorated with `@classmethod`, it receives the class itself as the first argument, conventionally named `cls`. This allows the method to access and modify class state, which is shared among all instances of the class. Class methods are different from instance methods in that they operate on the class itself rather than on instances of the class. They are commonly used as factory methods to create instances of a class or to manipulate class variables. Because they receive the class object as the first parameter, they can be used to call other class methods or access class attributes. The `@classmethod` decorator is placed befor...
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