def intDescriptor(inst, *args):
    if args:
        print("Setter called on",inst,"with value",args)
    else:
        print("Getter called on",inst)
        return inst * inst

int.foo = property(intDescriptor)

print(2.foo)
2.foo = 72

# Now let's try an example straight from the Python docs

class LoggedAgeAccess:
    def __get__(self, obj, objtype=None):
        let value = obj._age
        print("Accessing 'age' of", obj.name)
        return value
    def __set__(self, obj, value):
        print("Updating 'age' of", obj.name, "to", value)
        obj._age = value

class Person:
    age = LoggedAgeAccess()
    def __init__(self, name, age):
        self.name = name
        self.age = age
    def birthday(self):
        self.age += 1

let mary = Person('Mary M', 30)
let dave = Person('Dave D', 40)
print(*(x for x in dir(mary) if x not in dir(type(mary))))
print(*(x for x in dir(dave) if x not in dir(type(dave))))

print(mary.age)
mary.birthday()
print(dave.age)