No duplicate variable

[Terry Reedy]

King wrote:
> class A(object):
>     def __init__(self, value=0.):
>         self.value = value
> 
> class B(A):
>     def __init__(self, value=None):
>         A.__init__(self)
>         self.value = value
> 
> obj = B()
> 
> When "B" initializes, it overwrite "value" variable of "A". How do I
> make sure that no variable should not be defined with names of "A" in
> "B"?

By knowing the public interface of A before you inherit from it, so you 
do not do that.