On Sep 4, 7:09 am, "Marco Bizzarri" <[EMAIL PROTECTED]> wrote:
> Sorry... pressed enter but really didn't want to.
>
> As I said, let's say I have a class
>
> class A:
> def __init__(self):
> self.x = None
>
> Python makes the decision to allow the developers to directly access
> the attribute "x", so that they can directly write: "a.x = 1", or
> whatever; this has for me the unfortunate side effect that if I write,
> for example "a.y = 1", when I really wanted to write "a.x = 1" no one
> cares about it, and I'm unable to spot this error until later.
You can write code to guard against this if you want:
class A:
legal = set(["x"])
def __setattr__(self,attr,val):
if attr not in self.legal:
raise AttributeError("A object has no attribute '%s'" %
attr)
self.__dict__[attr] = val
def __init__(self,x):
self.y = x
I suspect most people who go into Python doing something like this
soon abandon it when they see how rarely it actually catches anything.
Carl Banks
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