On Fri, Aug 31, 2012 at 8:20 PM, Steven D'Aprano <[email protected]> wrote:
>
> Sequence
> The generalisation of lists, tuples and strings. Any object that has
> a known length where individual items can be retrieved with the
> __getitem__ method called sequentially: obj[0], obj[1], obj[2], ...
To expand on this, any object that has a __getitem__ method can be
iterated over until it raises an IndexError, not just object's that
have an __iter__ method, and __len__ is not a factor. For example:
class Test(object):
def __getitem__(self, n):
if n > 4:
raise IndexError
return 'test'
>>> list(Test())
['test', 'test', 'test', 'test', 'test']
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