Steven D'Aprano wrote: > [EMAIL PROTECTED] wrote: > > > Is there somthing wrong???? > > Kids today, don't they learn about inheritence? :-) > > Python's object model is that instances inherit both > methods and attributes from the class (and > superclasses). Methods are just a special case of > attributes: the method is a callable attribute. > > When you reference an attribute, Python first checks > the instance by looking up instance.__dict__, and if > that fails, it looks up instance.__class__.__dict__. > > (This is a simplification, e.g. it isn't exactly true > for objects with slots.) > > For attribute lookup (that is, the attribute reference > is on the right hand side of an assignment), the lookup > may fail and so the class attribute may be retrieved. > This is by design. > > For attribute assignment (that is, the attribute > reference is on the left hand side of an assignment), > the assignment will never fail. > > (Again, ignoring slots and any other special cases I > have't thought of.) > I believe he knows about inheritance, but not about the behaviour of the assignment. In many other OO languages, I believe you cannot have the same name for both instance variable and class variable. javascript has similar behaviour.
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