Abstract classes?

[Gerrit Holl]

Daniel T. wrote on 950756727:
> Also, any general critiques of this code?
> 
> class Observer:
>    def update( self ):
>       raise "sub-classes must over-ride this method"

raise NotImplementedError("sub-classes must override this method")
>>> print NotImplementedError.__doc__
Method or function hasn't been implemented yet.

The NotImplementedError was designed *exactly* for this case.

regards,
Gerrit.

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