Conditionally implementing __iter__ in new style classes

[harold fellermann]

> I'm trying to implement __iter__ on an abstract base class while I 
> don't
> know whether subclasses support that or not.
> Hope that makes sense, if not, this code should be clearer:
>
> class Base:
>     def __getattr__(self, name):
>         if name == "__iter__" and hasattr(self, "Iterator"):
>             return self.Iterator
>         raise AttributeError, name
>
> class Concrete(Base):
>     def Iterator(self):
>         yield 1
>         yield 2
>         yield 3

I don't know how to achieve it, but why don't you simply use

class Base:
	pass

class Concrete(Base):
	def __iter__(self) :
		yield 1
		yield 2
		yield 3


What is the advantage to have a baseclass that essentially does
some method renaming __iter__ ==> Iterator?

- harold -

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