What c.l.py's opinions about Soft Exception?

[Diez B. Roggisch]

Lie schrieb:
> I'm asking about people in c.l.py's opinion about a _probably_ very
> Pythonic way of doing something if such features is implemented. It is
> to be known that I'm not a Python expert and actually relatively new
> to Python programming, so probably I'm just not thinking pythonic
> enough yet or this feature might already exist somewhere in a
> different name.
> Anyway, I'm just asking for opinions, tell me problems I haven't
> foreseen, or whether such things would be hard to implement, or
> whether you think the idea is great or plain bad (and why).
> 
> Soft Exception
> What is "Soft Exception"?
> Soft Exception is an exception that if is unhandled, pass silently as
> if nothing happened. For example, if a variable turns into NoneType,
> it'll raise Soft Exception that it have become NoneException,
> programmers that wants to handle it can handle it with a try...except
> block while programmers that doesn't care about it (or know it won't
> be a problem to his code) can just leave the code as it is.
> 
> Soft Exception differs from Hard Exceptions (the regular Exception) in
> a way that Hard Exception must be handled at all cost or the program
> will be terminated while Soft Exception allow programmers not to
> handle it if they don't want to.

<snip/>

Is this soft-exception implemented anywhere, so that one can see what 
experiences and best practices have evolved around using it?

Diez