12. Descriptors (get, set, delete)

Descriptors are objects that control access to another object's attributes.

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Example

class Descriptor:
    def __get__(self, instance, owner):
        return instance._value
    def __set__(self, instance, value):
        instance._value = value
    def __delete__(self, instance):
        del instance._value

class MyClass:
    attr = Descriptor()

obj = MyClass()
obj.attr = 10
print(obj.attr)

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Wrap-Up

Descriptors power properties, methods, and many parts of Python's internals.