phil hunt wrote:
> Suppose I'm writing an abstract superclass which will have some
> concrete subclasses. I want to signal in my code that the subclasses
> will implement certan methods. Is this a Pythonic way of doing what
> I have in mind:
>
> class Foo: # abstract superclass
> def bar(self):
> raise Exception, "Implemented by subclass"
> def baz(self):
> raise Exception, "Implemented by subclass"
>
> class Concrete(Foo):
> def bar(self):
> #...actual implemtation...
> def baz(self):
> #...actual implemtation...
Yes, but raise NotImplementedError instead of Exception. Another trick
you can use is to prevent people from instantiating the abstract class:
class Foo:
def __init__(self):
if self.__class__ is Foo:
raise NotImplementedError
...
def bar(self):
raise NotImplementedError
--
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