python property
class Number:
    def __init__(self, number):
        self.__number = number
    def get_number(self):
        print("Getting...")
        return self.__number
    def set_number(self, number):
        print("Setting...")
        self.__number = number
        
    def del_number(self):
        print("Deleting...")
        del self.__number
    nb = property()
    nb = nb.getter(get_number)
    nb = nb.setter(set_number)
    nb = nb.deleter(del_number)
n = Number(42)
print(n.nb)
n.nb = 69
print(n.nb)
del n.nb
# Getting...
# 42        
# Setting...
# Getting...
# 69
# Deleting...
