Abstract Methods & Abstract Class

[Fredrik Lundh]

Andreas Kostyrka wrote:

> > Do we have something like abstract methods & Abstract class.
> >
> > So that my class would just define the method. And the implementation
> > would be defined by somebody else.
>
> class AbstractBase:
>     def method(self):
>         raise TypeError("abstract method called")
>
> But basically, Python does not have abstract methods, and usually doesn't
> need them.

the NotImplementedError exception is usually a better choice:

    class AbstractBase:
        def method(self):
            raise NotImplementedError("'method' implementation missing")

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