Simple usage of Python 3 descriptors

descriptor.py

class MyDescriptor:
    def __set_name__(self, owner, name):
        self.name = name

    def __get__(self, instance, owner):
        return f'Surprise from "{self.name}" descriptor'

    def __set__(self, instance, value):
        # You can set any property here or raise an exception to make it read only property
        pass

class Foo:
    bar = MyDescriptor()

print(Foo.bar)
o = Foo()
print(o.bar)

'''
OUTPUT:
Surprise from "bar" descriptor
Surprise from "bar" descriptor
'''