Re: Conditionally implementing __iter__ in new style classes

[infidel]

Something like this:

>>> class Base(object):
...     def __getitem__(self, key):
...             return key
...     def __iter__(self):
...             yield self[1]
...             yield self['foo']
...             yield self[3.0]
...
>>> class ConcreteIterable(Base):
...     def __iter__(self):
...             yield True
...             yield 'Blue'
...             yield 'Foo'
...
>>> class ConcreteNotIterable(Base):
...     pass
...
>>> [x for x in Base()]
[1, 'foo', 3.0]
>>> [x for x in ConcreteIterable()]
[True, 'Blue', 'Foo']
>>> [x for x in ConcreteNotIterable()]
[1, 'foo', 3.0]
>>>

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