Abstract classes?

[Gerrit Holl]

Skip Montanaro wrote on 950771718:
> 
>     Daniel> class Observer:
>     Daniel>    def update( self ):
>     Daniel>       raise "sub-classes must over-ride this method"
> 
> You might want to raise the standard NotImplementedError.  From its doc
> string:
> 
>     >>> help(NotImplementedError)
>     Method or function hasn't been implemented yet.

Daniel, please note that you probably don't have the help() function.

It's a function written by Skip to print an objects __doc__ attribute. So
this is really equivalent to:
print NotImplementedError.__doc__

You could write the help function like this:
def help(obj):
    """help(obj) -> None

    Print the docstring of an object to sys.stdout.
    """

    if hasattr(obj, "__doc__):
        print obj.__doc__
    else:
        print obj, "doesn't have a docstring"

regards,
Gerrit.
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