Bruce wrote:
>>>> class A:
> ... def __init__(self):
> ... self.t = 4
> ... self.p = self._get_p()
> ... def _get_p(self):
> ... return self.t
> ...
>>>> a = A()
>>>> a.p
> 4
>>>> a.t += 7
>>>> a.p
> 4
>
> I would like to have it that when I ask for p, method _get_p is always
> called so that attribute can be updated. How can I have this
> functionality here? thanks
You need to use a property, there are several possibilities to do so, a
common idiom is this:
class A(object): # must be newstyle
def __init__(self):
self._p = 6
def get_p(self):
return self._p
def set_p(self, v):
self._p = v
p = property(get_p, set_p)
Diez
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