Question

whats the reason to use the variable the self._age? A similar name that doesn’t link to the already used self.age?

class newprops(object):
    def getage(self):
        return 40
    def setage(self, value):
        self._age = value
    age = property(getage, setage, None, None)

Answer 1

self.age is already occupied by the property, you need to give another name to the actual variable, which is _age here.

BTW, since Python 2.6, you could write this with decorators:

def newprops(object):

    @property
    def age(self):
        return 40

    @age.setter
    def age(self, value):
        self._age = value