properties and get/set methods

[Dan Bishop]

Timothy Grant <tjg at craigelachie.org> wrote in message news:<mailman.1049581810.25706.python-list at python.org>...
> Hi all,
> 
> Given the following class...
> 
> class monty(object):
>     def __init__(self):
>         self.__foo = 0
>         self.__bar = 0
> 
>     def setvar(self):
>         do_some_attribute_generic_thing()
>         set_appropriate_attribute()        
> 
>     def getvar(self):
>         do_some_attribute_generic_thing()
>         return appropriate_attribute()
> 
>     foo = property(getvar, setvar)
>     bar = property(getvar, setvar)
> 
> =====================================
> 
> Is it possible to determine which attribute was used to as the trigger for the 
> call to setvar() or getvar()? so that set_appropriate_attribute() or 
> appropriate_attribute() can set the correct attribute or get the correct 
> attribute?

Why not just use two different getvar and setvar functions?

However, if you absolutely must insist on using only one getter/setter
pair, you could use

class monty(object):
    def __init__(self):
        self.__foo = 0
        self.__bar = 0

    def setvar(self, value, whatCalledIt=None):
        do_some_attribute_generic_thing()
        set_appropriate_attribute()        
 
    def getvar(self, whatCalledIt=None):
        do_some_attribute_generic_thing()
        return appropriate_attribute()
 
    foo = property(lambda self: self.getvar('foo'),
                   lambda self, value: self.setvar(value, 'foo'))
    bar = property(lambda self: self.getvar('bar'),
                   lambda self, value: self.setvar(value, 'bar'))